21. A new study suggests that increased warming in Arctic areas could ( ) huge amounts of carbon into the atmosphere.
A. relate
B. relieve
C. retain
D. release
【答案】D。“新的一项研究表明北极地区的气候变暖加重，可能会释放大量二氧化碳到大气中。”A 选项 relate 意为：与…有关，relate to 意为：涉及、有关;relate with 意为：使相关、使符合。B 选项 relieve 意为：减轻;C 选项 retain 意为：保留;D 选项 release 意为：释放，release into 释放到…。只有 D 选项符合句意。故本题正确答案选 D。
22. Many housing experts warn that the end of the extra $600 a week in federal unemployment money is likely to spark a wave of ( ) that could put millions of out of their homes.
A. delinquencies
B. dissatisfactions
C. frauds
D. evictions
【答案】A。“住房专家警告说，每周额外 600 美元的联邦失业救济金到期后，很有可能引发一波拖欠债款的浪潮，致使数百万人无家可归。”人们领不到失业救济金就会出现欠款不还的现象。A 选项：拖欠债务;B 选项：不满意;C 选项：诈骗;D 选项：驱逐。故本题正确答案选 A。
23. The United States has became ( ) the most important driver of Vietnam’s export engine, accounting for two thirds of Vietnam’s…… export growth this year.
A. fair and square
B. far and away
C. cut and dried
D. hard and fast
【答案】B。“美国无疑已经成为越南出口最重要的推动力，今年占越南出口量的三分之二。”A 选项：光明正大地、诚实地;B 选项：无疑地、显然地;C 选项：固定的;D 选项：严格的、固定不变的。修饰动词 became 应该用副词，CD 选项为形容词短语搭配，A选项不符合句意。故本题正确答案选 B。
24. Once we realized it was a cluster epidemic we worked really hard to ( ) people that were infected and quarantine the rest of the people that person’s network.
A. remind
B. leave
C. isolate
D. advise
【答案】C。“一旦我们意识到这是群体流行病，便会努力去隔离那些受到感染的人，并对其所接触过的人都进行检疫隔离。”A 选项：提醒，常与 of 连用;B 选项：离开;C选项：隔离;D 选项：建议。只有 C 选项符合句意。故本题正确答案选 C。
25. We know if we have a plan and ( ) it, we can work our way through very difficult and unknown situations.
A. stick to
B. adapt to
C. attach to
D. appeal to
【答案】A。“我们知道，如果我们有了计划并坚持下去，那么就能通过努力来摆脱困难和未知的境遇。”A 选项：坚持…;B 选项：适应…;C 选项：附属于…;D 选项：吸引、呼吁。只有 A 选项符合句意。故本题正确答案选 A。
