4. I have to go at once.
A) soon B) immediately
C) now D) early
4.B. at once的含义为立刻， 因此B是答案。soon的词义为很快， 不久， now的词义为现在， early的词义为早。
immediately是高频词汇，在词汇选项的其他练习题中也出现了：
5. Have you talked to her lately?
A) lastly B) shortly
C) recently D) immediately
5. lately是近来，最近， 因此C是答案。
需要掌握的相关近义词词组：
shortly soon 即刻， 不久
lastly finally eventually at last in the end最终， 最后
以上这组副词也属于在复习中应该掌握的高频词汇，职称英语词汇选项练习部分出现了关于eventually的练习题：
6. The herb medicine eventually cured her diseases.
A) nicely B) apparently
C) finally D) naturally
6.C. eventually是派生词， 其词义为最终， 终于， 所以C是答案。
需要掌握的相关近义词词组：
cure treat - remedy治疗
apparent obvious evident - clear 明显的
eventually finally at last in the end ultimately 最终
7. The policeman asked him to identify the thief.
A) name B) distinguish
C) capture D) separate
7.A/B. identify的基本词义为识别， 鉴别， 因此A是答案。
distinguish tell 区分，分辨
separate divide分开
8. We were all there when the accident occurred.
A) happened B) broke
C) spread D) appeared
8.A. occur是单义词， 其基本词义为发生。因此A是答案。
需要掌握的相关近义词词组：
happen occur take place break out 发生
appear seem look 看起来
That dog looks/seems/appears dangerous.那只狗看起来很危险。
break是高频动词，与其相关的短语结构是常见考察点：
break away 逃走;逃脱
break down损坏
break into 闯入
break out 突然发生
break up分裂， 结束
break into pieces 成为碎片
break record 打破纪录
A) soon B) immediately
C) now D) early
4.B. at once的含义为立刻， 因此B是答案。soon的词义为很快， 不久， now的词义为现在， early的词义为早。
immediately是高频词汇，在词汇选项的其他练习题中也出现了：
5. Have you talked to her lately?
A) lastly B) shortly
C) recently D) immediately
5. lately是近来，最近， 因此C是答案。
需要掌握的相关近义词词组：
shortly soon 即刻， 不久
lastly finally eventually at last in the end最终， 最后
以上这组副词也属于在复习中应该掌握的高频词汇，职称英语词汇选项练习部分出现了关于eventually的练习题：
6. The herb medicine eventually cured her diseases.
A) nicely B) apparently
C) finally D) naturally
6.C. eventually是派生词， 其词义为最终， 终于， 所以C是答案。
需要掌握的相关近义词词组：
cure treat - remedy治疗
apparent obvious evident - clear 明显的
eventually finally at last in the end ultimately 最终
7. The policeman asked him to identify the thief.
A) name B) distinguish
C) capture D) separate
7.A/B. identify的基本词义为识别， 鉴别， 因此A是答案。
distinguish tell 区分，分辨
separate divide分开
8. We were all there when the accident occurred.
A) happened B) broke
C) spread D) appeared
8.A. occur是单义词， 其基本词义为发生。因此A是答案。
需要掌握的相关近义词词组：
happen occur take place break out 发生
appear seem look 看起来
That dog looks/seems/appears dangerous.那只狗看起来很危险。
break是高频动词，与其相关的短语结构是常见考察点：
break away 逃走;逃脱
break down损坏
break into 闯入
break out 突然发生
break up分裂， 结束
break into pieces 成为碎片
break record 打破纪录
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