单项选择题

The first ______of the bridge is one hundred meters long.

[A] preface
[B] span
[C] block
[D] phase
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单项选择题
When a psychologist does a general experiment about the human mind, he selects people ______and asks them questions.
[A] at random
[B] at will
[C] at length
[D] in essence
单项选择题
Your great financial burden does not justify your ______ your parents in such a relentless way.
[A] treating
[B] treat
[C] to treat
[D] treated
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