题目内容

We shall probably never be able to _____ the exact nature of these sub-atomic particles.
[A] assert
[B] impart
[C] ascertain
[D] notify

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[A] respond
[B] return
[C] retort
[D] reply

[A] on
[B] from
[C] at
[D] about

That sound doesn’t _____ in his language so it’s difficult for him to pronounce.
[A] happen
[B] take place
[C] occur
[D] run

Changes in the social structure may indirectly _____ juvenile crime rates. For example, changes in the economy that lead to fewer job opportunities for youth and rising unemployment in general make gainful employment increasingly difficult to obtain.
[A] affect
[B] reduce
[C] check
[D] reflect