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：discover　(the　presence　or existence of sth．)，“查觉”、“发现”，如：The dentist could detect no sign of decay in her teeth．牙医在她的牙齿上找不到蛀蚀的迹象。discern：see clearly with eyes or mind,”辨明”、“识别”，主语一般是人或指人未辨别某事，如：It is difficult to discern the truth．很难了解真相。ascertain，
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