The scientists were trying to look for all possible _______ as to where this species came from.
A．signalsB．marksC．cluesD．spots
C

試題分析：句意，科學(xué)家們正在努力尋找一切關(guān)于人類從哪里來的線索。Signals信號marks痕跡clues線索spots地點(diǎn)，根據(jù)題意，故選C。
點(diǎn)評：首先要理解句子意思，同時要知道各個選項(xiàng)的詞義，把各個詞義放入句中進(jìn)行比較，不難選出正確答案。
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