1. Scientists are working hard to come up with a sure solution to the food _________ for mankind.
A. decline B. rarity
C. scarcity D. shortage
2. The managing director took the __________for the accident， although it was not really his fault.
A. guilt B. blame
C. charge D. accusation
3. With all its advantages， the computer is by no means without its ____________.
A. boundaries B. restraints
C. confinements D. limitations
4. Except on official ___________ such as formal receptions， American society has a certain amount of informality.
A. cases B. situations
C. events D. occasions
5. The young couple were quite excited by the _________ of having their first child.
A. perspective B. prospect
C. future D. foresight
1．【答案】D
【解析】D項shortage n．“不足，缺少”符合題意。其他三項中，decline n．“下降，減少，衰落”；rarity n．“稀少，少見的人或東西”（常與不定冠詞連用）；scarcity n．“缺乏，稀少”，都與題意不符。
2．【答案】B
【解析】B項blame n．“（過錯，事故的）責任；責怪，責備”符合題意。如：put／lay／bring the blame on sb．“怪在某人身上”；The blame rests on sb．“責任在某人”；take the blame on oneself for sth．／bear the blame for sth．“承擔……的責任”。其他三項中，guilt n．“罪，罪責”；charge n．作“罪名，指控”解時不與take搭配；take charge of sth．表示“對……負責，接管”的意思；accusation n．“指責，控告”（不說take accusation for sth．），都與題意不符。
3．【答案】D
【解析】D項limitation n．“限制，限度，極限”符合題意。其他三項中，boundary n．“分界線，邊界”；restraint n．“（情感的）抑制，限制，克制”；confinement n．“限制（在范圍內(nèi)）；監(jiān)禁”，都與題意不符。
4．【答案】D
【解析】D項occasions“重大活動，盛會；時刻，場合；時機，機會”符合題意。On official occasions“在正式場合”；on occasion（s）“有時，間或”；on such occasions“在這樣的場合”；on many／several occasions“有許多次／有好幾次”；on one occasion“有一次”；on the occasion of“在……的時候，在……之際”。其他三項中，case n．“情況，事實；案件”（注：case與in而不與on搭配）；situation n．“形勢，局面；環(huán)境，狀況；地點，位置”；（一般與介詞in相搭配）；event n．“事件；（體育）比賽項目”（與介詞in而不與on搭配），都與題意不符。
5．【答案】B
【解析】B項prospect n．“前景；前途；展望（一般作不可數(shù)名詞用，與the連用，如the prospect of a holiday；the prospect of owning one’s own house）”，符合題意。其他三項中，perspective n．“遠景，景觀；透視畫法”；future n．“將來，未來；前景，前途”（多與不定冠詞連用，如a bright future）；foresight n．“遠見；預(yù)見性；預(yù)言的能力”，都與題意不符。