From goldfish to sharks, fish of all sizes have lived on Barth for hundreds of millions of years. But do they ever get thirsty?
The answer is yes! Some fish do, at least. But there is a big difference between fish that live in saltwater and ones that live in freshwater.
Bony fish have some salt concentration (含盐量) in their bodies. For bony fish in saltwater, their concentration is lower than the water they live in. Through osmosis (渗透作用) these fish will lose lots of water through their bodies. In order to make up for this loss, they drink lots of water, so it’s easy to say that they can be thirsty. Although drinking saltwater is never a good idea for humans, fish can drink it because they can get rid of the salt through their gills (鳃).
But sharks are an exception. Sharks can make their concentration match the water around them. They do this by building up urea (尿素) in their blood, so they probably don’t get very thirsty. But blood with a high salt concentration can also be bad. The high concentration means sharks won’t do very well in freshwater-water can enter the sharks’ bodies by osmosis and even cause them to explode!
Freshwater fish, on the other hand, are unlikely to become thirsty. Because they live in a less salty environment, they have a different problem: water goes inwards and dilutes (冲淡) their blood. Freshwater fish therefore need to get rid of this extra water. So now we know that saltwater fish can become thirsty and drink water, while freshwater fish will avoid drinking but pee (小便) a lot.
【小题1】What’s the writer’s purpose of this article?| A．To show that fish have a long history of living on Earth. |
| B．To explain why fish of all sizes can become thirsty like humans. |
| C．To prove that fish are different in terms of whether they get thirsty. |
| A．Because they have a high salt concentration |
| B．Because they need to take in salt through their grills |
| C．Because they will lose lots of water through their bodies. |
| A．They don’t get thirsty at all because they live in saltwater. |
| B．Too much water in their blood can be bad. |
| C．They pee a lot after drinking too much water. |
| A．A science book | B．A travel guide | C．A fashion magazine |
My name is Olivia. I am on a trip with my parents in Nepal now. Today is Thursday. It's a special (特别的) day for elephants (大象) in Nepal.
I like elephants. They help people a lot. Some of them need to work all year.
I hope (希望) people can have more love for elephants. I think we can be good friends one day.
| A．So I think it's really good to have an activity like this. |
| B．Now, I'm in Sauraha to have a picnic with lots of elephants. |
| C．And I join in a special activity today. |
| D．For people, these foods usually taste great. |
| E．The picnic lasts (持续) for an hour and all of us are happy. |
Lobsters are nocturnal creatures(夜行物)，so it is best to hunt(捕捉) them at night when they are active. You can catch lobster by hand, but you should wear thick gloves because lobster’s claws are strong. A very large lobster could break your finger.
Interestingly, in the past, lobsters were only served to prisoners as they were considered as a poor man’s food. Nowadays, lobsters are an expensive and popular dish.
【小题1】What color is the lobster when cooked?
| A．Blue | B．Red | C．Yellow |
| A．In the morning | B．In the afternoon | C．At night |
| A．Yes, they can | B．No, they can’t | C．Not mentioned |
| A．The lobster is colorful in the sea. |
| B．The lobster is active during the night. |
| C．People seldom considered the lobster as good dish in the past. |
Meet the only one pig that could paint, Picasso! The pig is from South Africa. She has the same name as the great Spanish artist. And she can paint, too. She knows how to dip (蘸，浸) the brush to paint and she paints with the brush in her mouth. She can even “sign” up (签名) on her paintings by pressing (压) her mouth on the page.
It all started earlier this year in January. Picasso’s owner(主人) Joanne Lefson saved her from a factory farm. At that time, Picasso was only 4 months old. Lefson quickly taught her how to paint. After four months, Picasso could paint with her mouth very well.
Now Lefson wants to have a show of Picasso’s works sometime next year. She wants more people to know that factory farms are not nice for animals to live in. She wants the animals to live in better places.
【小题1】The pig Picasso comes from ________.| A．South America | B．South Africa | C．Spain | D．North Africa |
a. dip the brush to paint b. sign up on her paintings with her mouth
c. have a show of her works d. paint with the brush in her mouth
| A．a, b, c | B．a, c, d | C．a, b, d | D．b, c, d |
| A．six years | B．ten years | C．four months | D．eight months |
| A．Picasso to make money for her | B．to become a famous painter |
| C．Picasso to become famous | D．animals to live a better life |
| A．A Smart Pig Can Paint | B．The Paintings of a Pig |
| C．A Show of Picasso’s Works | D．How the Pig Paint |
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