2019年mpacc考试英语真题——其他382

{01}The biologist started to ________ the be-havior of birds from his childhood.
A.observe
B.see
C.understand
D.know
解析：本题意在考查词语的意思辨析．全句意思为“这个生物学家从小就开始观察鸟的行为．”不可能从小就“开始了解”、“开始知道”．故不选C、D．observe指“观察，注意”，而see指“看见，看到”．
本题选A。
{02}This is a problem which ________ very careful thought.
A.shares
B.persuades
C.dislikes
D.calls for
解析：
本题选D。