1．D　根据We have met the enemy, and he is ours. We bought him at a pet shop. When monkey­pox, a disease usually found in the African rain forest, suddenly turns up in children in the American Midwest, it’s hard not to wonder if the disease that comes from foreign animals is homing in on human beings.可推断，从宠物商店购买的动物身上携带疾病。

　　2．D　根据A strange illness killed Isaksen’s pets, and she now thinks that keeping foreign pets is a bad idea.“I don’t think it’s fair to have them as pets when we have such a limited knowledge of them，”可判断。

　　3．B　根据上文，猴痘是一种从非洲的动物身上传播到人类身上的疾病，紧接着作者说这种没有经过严格控制的法律需要改变。最后又以猴痘为例，由此可判断“the wake­up call”表示“一种警示”。

　　4．A　根据We know very little about these new diseases. A new bug (病毒) may be kind at first. But it may develop into something harmful.可知新的病毒会转化成有害的东西，最后导致人与人的传播，因此我们必须与新的疾病作斗争。

　　5．C　最后一段大意：我们必须改变不检疫而引进野生动物的规定，这样才能避免疾病的传播。

　　阅读理解

　　A food additive is any substance that is added to food. Many people are put off by the idea of“chemicals in food.”The truth is that all food is made up of chemicals. Natural substances like milk, as well as man-made ones like drinks on sale in the market, can be described by chemical formulas. Some chemical substances are indeed harmful, but a person who refused to consume any chemicals would find nothing to eat.

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