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 动词辨析。detect：discover(the presence or existence of sth．)“察觉、发现”，如：The dentist coulddetect 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“确知”、“探询”，．如：We must ascertain the usual customs of the local people and arrange accordingly．我们必须了解当地人民的风俗习惯，做出相应安排。locate“寻找……的地点”，如：I cannot locate the shop．我找不到这家商店。
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