The biologist started to ________ the be-havior of birds from his childhood.
- A.
observe
- B.
see
- C.
understand
- D.
know
A
本題意在考查詞語(yǔ)的意思辨析．全句意思為“這個(gè)生物學(xué)家從小就開(kāi)始觀察鳥(niǎo)的行為．”不可能從小就“開(kāi)始了解”、“開(kāi)始知道”．故不選C、D．observe指“觀察，注意”，而see指“看見(jiàn)，看到”．
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