2. 外语
  3. Now there are sophisticated tests which can ______ poisons in the tiniest amount—not even enough to kill a mouse.

Now there are sophisticated tests which can ______ poisons in the tiniest amount—not even enough to kill a mouse.

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问题 Now there are sophisticated tests which can ______ poisons in the tiniest amount—not even enough to kill a mouse.
选项 A、discern
B、ascertain
C、detect
D、locate
答案C
解析 detect"察觉，发现"；discern"辨明，识别"，主语一般是人或指人为辨别某事；ascertain"确知，探询"；locate"寻找……的地点"。
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