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The desert locust (蝗虫) is the most dangerous migratory pest with a huge appetite unmatched in the insect world. In just one day, a swarm of locusts the size of Paris could consume the same amount of food as half the population of France. They annually reproduce, concentrate and then form swarms that can move up to 150 kilometers per day.

To control these swarms, some experts think drone (无人机) technology could provide survey and control teams with an inexpensive and efficient method of searching for these destructive insects.

Unmanned aerial vehicles (UAVs) — also known as drones — could be used to automatically collect high-resolution imagery of green, vegetated areas potentially affected by locusts.

Controlled by a hand-held tablet, the UAV would follow a pre-programmed flight path, covering a 100 kilometer survey radius to collect data. Then the survey teams use the data to identify areas that seem most likely to harbor locusts and travel directly to suspicious locations. Once the team reaches such an area, the UAV could be launched to fly overhead and identify other nearby areas affected by locusts that may require treatment. A separately controlled UAV could then be used to administer pesticides directly onto the locust concentrations. UAVs could also be used to check for locusts in areas that are insecure or cannot be accessed by ground teams.

Pest control operations would become safer, as human operators would no longer be exposed to potentially dangerous pesticides while getting rid of the insects. They would also become more effective, since drones would be able to spray pesticides precisely.

The Food and Agriculture Organization (FAO) of the United Nations is currently working with university researchers and private sector partners in Europe to address challenges of drone technology concerning design, endurance, power, and detection of green vegetation and locusts. The FAO remains hopeful that within five years, UAVs will play an essential role in protecting food supplies and livelihoods from the desert locust, as part of the fight against global hunger and poverty.

【小题1】What does the author try to express by mentioning France in Paragraph 1?
A.Desert locusts are a great threat to food supply.
B.France is one of the disaster areas affected by desert locusts.
C.It’s hard to deal with the problems caused by desert locusts.
D.Desert locusts are a migratory pest that can travel extremely fast.
【小题2】What’s the fundamental purpose of drone technology?
A.To detect desert locusts.B.To locate the affected locations.
C.To kill desert locusts effectively.D.To free operators from chemicals.
【小题3】Which of the following can best describe UAVs?
A.They are convenient but expensive.B.They are creative but time-consuming.
C.They are safe but hard to operate.D.They are smart but still need improving.
【小题4】What is the best title for the text?
A.Preventing the Spread of Desert Locusts
B.FAO Continues Fighting Against Locusts
C.Massive Locusts Threaten Millions of People
D.Locust Control Throug hout History
20-21高二下·四川成都·阶段练习
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It took me a moment to realize what had happened. Three days had passed and Rita seemed to get weaker and weaker. The rain had stopped. However, the sky was still cloudy, and it was so dark that I couldn’t see the buildings even across the road. I took a pressure reading from the weather station: 947mb, which let me know exactly where I was—in the eye of the storm.

There were rains and winds still, but not oppressive (难以忍受的)anymore. There was still no power, hot water or food. Besides, I didn’t sleep well for all these days, but I felt more relaxed since the weather report said Rita was leaving. What’s more, I was luckier than those people who had lost their homes or even worse, lost their lives because of Rita.

As I travelled further to the west, going after the storm, the damage along the way became less severe. I arrived in Houston after a tricky journey with my fuel supplies almost all gone. However, I came across another storm chaser (追逐者) who had 45 gallons of petrol. He helped me and we shared our working experience these days. With a complete stroke of luck I found a run-down hotel that allowed me to have a room overnight before the midnight. Although there was no running water, no power and no air conditioning, I curled up into a corner and fell asleep quickly.

I woke up the next morning, and what a change! The sky was blue and cars were moving around. Sirens could be heard as convoys (护航队) of emergency managements started to head west towards where I had come from. "The storm had stopped and I could go home. I gave all my remaining supplies to other people at the hotel and headed towards the airport. Houston Airport was not damaged, so I took my flight and drank my first hot drink in four days.

All in all, when I came back home, I was proud that I finally made it again to follow and record the storm and I really learned a lot these days. Although it’s dangerous, I love my job as not many people would go into the eye of an intense storm.

【小题1】We can know from the passage that “Rita” is ________.
A.a pet
B.a storm
C.a friend of the author
D.a citizen in Houston
【小题2】What can we infer from the passage?
A.The author was a storm chaser.
B.The storm lasted for at least a week.
C.The author didn’t like Houston at all.
D.Houston was very badly damaged by the storm.
【小题3】How did the author probably feel after the storm?
A.Anxious.
B.Disappointed.
C.Satisfied.
D.Scared.
【小题4】What is the passage mainly about?
A.Ways to survive in a storm.
B.The weather changes in Houston.
C.The author’s experience in the storm.
D.Damages caused by the storm in Houston.

A restaurant owner’s remarkable act of heroism saved many lives during a storm in Rolling Fork, Mississippi, which destroyed a local restaurant.

Tracy Harden, the owner of Chuck’s Dairy Bar, rushed her staff into a walk-in cooler moments before a tornado hit the establishment on Friday.

Harden spoke to Good Morning America reporter Robin Roberts on Monday alongside two employees, Barbara Pinkins and Carolyn Washington, who were both in the restaurant when the tornado hit.

As the horrible tornado tore through the local area, Harden said she only had a minute of advance notice before it came moving rapidly through the restaurant.

“I got two text messages back-to-back from my sister and my daughter in Vicksburg and they both said, “There’s a tornado down, get to a safe place.’ At the same time I had my teenage cashier came running towards the back of the building saying, ‘My mother is on the phone and she said there is a tornado down here.’ At that point, most of us were towards the back of the building and the lights flickered(闪烁). And I just shouted, ‘Cooler!’ And my husband opened the cooler door and started pushing us in.”

Harden said that once her husband got them all inside, including himself, “he lost control of the door, the wind took the door and somehow he was able to get the door back.”

“Just before it shut, he looked up and he said, ‘I see the sky,’ so that let us know that this was way worse than anything we could have imagined,” she continued. “And the roof was gone.”

Pinkins, meanwhile, recalled the chaos(混乱场面)before the tornado touched the restaurant, as Harden led people to safety. She said she remembered hearing Harden say,“Calm down. Everybody gets to the cooler!”

“By the time we got to the cooler, I couldn’t hear anything but the ceiling falling,” Pinkins said through tears, hugging Harden.

【小题1】Where was Harden when the tornado struck?
A.In Chuck’s Dairy Bar.
B.In Vicksburg.
C.In Good Morning America station.
D.In Robin Roberts’ restaurant.
【小题2】What can we infer about the tornado?
A.It was slow but frightening.
B.It was the worst in local history.
C.Harden lost her husband because of it.
D.Harden received an advance notice about it.
【小题3】Which of the following best describe Harden?
A.Ambitious and energetic.
B.Brave and calm.
C.Optimistic and determined.
D.Selfless and tough.
【小题4】What can be a suitable title for the text?
A.Methods to Survive a Tornado
B.Damage Brought by a Tornado
C.Restaurant Owner Saved her Staff from Tornado
D.Horrible Tornado Destroyed a Local Restaurant

Natural disasters take many different forms and can happen without warning. Earthquakes, floods, vol-canoes, droughts, typhoons, and hurricanes are all natural disasters.

The earthquake of 26 December 2004 resulted in one of the worst natural disasters in living memory. It was a massive underwater quake and occurred in the Indian Ocean. This caused a huge tsunami (海啸) to cross the Indian Ocean. It destroyed coastlines and communities and brought death and destruction to many people. The survivors needed fresh water, food and shelter as well as medical help. People from all over the world gave money to help the people survive.

The surface of the Earth has not always looked as it does today; it is moving continuously (although very slowly) and has done so for billions of years. This is one cause of earthquakes, when one section of the Earth crashes with another. Scientists can predict where this might happen and the area between plates is called a fault line. However, earthquakes do not always happen on fault lines, which is why they are so dangerous and unpredictable.

All the disasters are very dangerous and continue to kill thousands of people each year,but they are nowhere near the most dangerous disaster to ever happen on earth. One type of event in the earth’s history has regularly killed millions of beings: asteroid (小行星) impacts (撞击). About once every million years the Earth is hit by a piece of rock and ice from space large enough to cause massive destruction (including earthquakes, volcanoes and ice ages) and sometimes to kill entire species. Sixty-five million years ago more than half the earth’s species were killed by such a disaster,including all the dinosaurs (恐龙). Disasters on the Earth may seem dangerous, but the biggest threat to humans is likely to come from space.

【小题1】What did the world do when the tsunami occurred in the Indian Ocean?
A.They gave away money to the beggars.
B.They sponsored to help the people survive.
C.They donated their art works to the survivors.
D.They helped rebuild the coastlines and communities.
【小题2】What can scientists predict about earthquakes?
A.The possible time.
B.The possible climate.
C.The possible place.
D.The possible frequence.
【小题3】Which is the best heading that matches Paragraph 3?
A.What do earthquakes destroy?
B.Why do earthquakes happen?
C.How can we prevent earthquakes?
D.Which is the most dangerous natural disaster?
【小题4】Where does the author think the most dangerous natural disaster will come from?
A.Space.
B.Earth.
C.Humans.
D.Wild animals.

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