问题 问答题

科学实验中,为了探究胰岛的功能,科学家切除了一只狗的胰腺,结果发现,这只狗排出的尿液常会吸引许多蚂蚁,你知道这是为什么吗?请简要说明你的理由。

答案

这只狗的尿液里含有糖。因为胰岛素有调节血糖浓度的作用,切除胰腺同时也是切除了胰岛,致使狗的身体不能分泌胰岛素,一部分血糖随着尿液排出体外,形成糖尿,所以这只狗的尿液会吸引蚂蚁。

阅读理解

What do you think is the most common illness? Do you get ill sometimes? We are lucky to live now, because there are lots of medicines to make people better.

The most common illness in the world is the cold. It often begins with a sore throat. Then you sneeze and your nose runs. You usually have a headache too. Often you cough later. It’s not a very bad illness, but you can feel quite ill.

There isn’t a cure (治愈) for a cold, but you can take medicines to make you feel better. For instance, aspirin (阿斯匹林) can stop your headache. It is good to rest, and to drink a lot of water too. A doctor once said to me, “With the proper medicine, a cold will continue for seven days. With no medicine, it will continue for a whole week!”

Where does our medicine come from? A long time ago, people knew that some plants made them feel better. They ate the leaves, the roots, the fruit, or the seeds of plants. For instance, the juice of lemons makes a sore throat feel better.

In modern times, scientists have looked at these plants, and found out which chemicals (化学物质) are in them. Many of our medicines today are made from those chemicals.

There are some illnesses which we can’t cure yet. And nobody has found a cure for old age. But because of modern medicines, most people now live longer than their grandparents.

小题1:How does a cold often begin?

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小题2:Can aspirin stop a headache?

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小题3:How long does a cold usually continue?

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小题4:What kind of juice makes a sore throat feel better?

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小题5:What are many of our medicines today made from?

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单项选择题