The scientists were trying to look for all possible _______ as to where this spe
题型：不详难度：来源：
The scientists were trying to look for all possible _______ as to where this species came from.| A．signals | B．marks | C．clues | D．spots |
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答案
| C |
解析
试题分析：句意，科学家们正在努力寻找一切关于人类从哪里来的线索。Signals信号marks痕迹clues线索spots地点，根据题意，故选C。
点评：首先要理解句子意思，同时要知道各个选项的词义，把各个词义放入句中进行比较，不难选出正确答案。 |
举一反三
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