．"The lack of labeling"

　　in Paragraph 4 indicates ______.

　　A．information concerning gene sources is unavailable to customers

　　B．it is currently possible to find the origins of some allergies

　　C．scientists try to hide potential dangers from customers

　　D．the US government is responsible for GE food

　　3．According to Paragraph 5, GE food is unnecessary because______.

　　A．it won't help solve the problem of hunger in the world

　　B．there are potential dangers in producing GE food

　　C．we're now producing more food than before

　　D．customers will benefit from GE food

　　．What is the author's attitude towards genetic engineering?

　　A．Welcoming．

　　B．Disapproving．

　　C．Unconcerned．

　　D．Optimistic．—4、CAAB

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Medical drugs sometimes cause more damage than they cure. One solution to this problem is to put the drugs inside a capsule, protecting them from the body—and the body from them—until they can be released at just the right spot. There are lots of ways to trigger (引发) this release，including changing temperature, acidity, and so on. But triggers can come with their own risks—burns, for example. Now, researchers in California have designed what could be a harmless trigger to date: shining near­infrared light (NIR, 近红外线) on the drug in the capsule.

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