2. 外语
  3. Observations were made______the children at the beginning and at the end of pre school and first grade.

Observations were made______the children at the beginning and at the end of pre school and first grade.

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问题 Observations were made______the children at the beginning and at the end of pre school and first grade.
选项 A、towards
B、of
C、on
D、with
答案B
解析 考查介词用法。本句的正确语序为Observations——the children were made at…，故[B]符合句意。observe on作“评论，评说”讲，不能把它当成“对…行进观察”；也不能说make observations on sb．。
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