Caffeine, a chemical typically 【小题1】 (find) in coffee, has caused a lot of concern because it is one of the few drugs that show up regularly in our food supply. You probably 【小题2】 (use) caffeine since childhood. Caffeine was in your first Coke. If you ever enjoyed a chocolate bar, you ate caffeine. Soft drinks are the major source (来源) of caffeine for most children and even some adults. 【小题3】 (recent), caffeine has found its way into orange, apple, and other flavored drinks.

Small amounts of caffeine — a cup 【小题4】 two of coffee a day — seem safe for most people. However, some people have trouble with even small amounts. One cup of coffee 【小题5】 the late afternoon or evening will cause 【小题6】(they) to stay awake almost all night. Larger amounts of caffeine can cause a problem 【小题7】 (call) caffeinism. You get very nervous and you can’t sleep.

Caffeine may be the possible 【小题8】 (explain) for some birth defects (缺陷) in humans, too. One study showed that women who drank a lot of coffee, like eight or more cups per day, 【小题9】 they were pregnant were more likely to have children 【小题10】 birth defects.

Are you a tea drinker? If so, you’re not alone. There are many kinds of teas in China. Longjing tea, 【小题1】 has topped the list of the most ten famous teas in China, is named after its production region — Longjing Village of West Lake. The good environment and water resources have contributed much to the 【小题2】 (grow) of the tea, confirming the saying that “Longjing tea is the 【小题3】 (good) among all the teas in the world”.

Thanks 【小题4】 Emperor Qianlong, the tea has earned a high reputation. The story went that Emperor Qianlong once travelled in Hangzhou and he saw some ladies picking the tea at 【小题5】 foot of the mountain. He was so 【小题6】 (interest) in their movements that he decided to have a go himself.

While 【小题7】 (pick) the tea, he received the news of his mother’s illness, so he carelessly put the leaves in his sleeves and left Hangzhou for Beijing. He visited his mother 【小题8】 (immediate) upon his arrival in Beijing, and his mother smelt the fragrance of the tea leaves from his sleeves and wanted to have a taste. After drinking a cup of tea, she found herself completely 【小题9】 (refresh), and she even praised it as a cure for her illness. At last, it 【小题10】 (choose) as the tribute tea.

Tea is one of the 【小题1】 (much) popular drinks in the world. You make it by pouring hot water over the dried leaves of a tea plant. For 【小题2】 (hundred) of years people believed that tea could cure illnesses, and they used 【小题3】 as medicine. Today scientists know that tea contains chemicals that prevent cells from dying. Most teas have caffeine in them, 【小题4】 makes you feel more active. Some people have problems 【小题5】 (drink) tea because it can cause sleeplessness.

The tea plant 【小题6】 (grow) best in tropical and temperate places where rain falls throughout the year. Teas can be grown from sea level 【小题7】 about 2,000 metres, but the best quality grows in higher regions.

Tea comes from the leaves and buds of tea plants. Wild plants can be up to 9 metres high, however, on tea plantations, 【小题8】 (pull) the leaves 【小题9】 (easy), people cut them back to a bush of about a metre in height. It takes a plant three to five years before it is ready for picking.

A picker can harvest about 20 kg of tea a day. On large tea plantations the leaves are harvested by machines, but the quality of tea is 【小题10】(high) when the leaves are picked by hand.