101. Professor Smith and Professor Brown will _____ in giving the class lectures.
A. exchange B. alter C. shift D. alternate
[答案] D. alternate.
[注释] alternate vt./vi. 轮流，交替发生或出现：Wet days alternate with fine days.(晴雨天交替更迭。)The weather today will alternate between fine and cloudy.(今天的天气将是晴间多云。)shift般动，移动（vt.）；转移到，迁移（vi.）；改变：1)Lend me a hand to shift the piano, will you?(请帮个忙搬一下这台钢琴。) 2)They have shifted away from this area.(他们已从这一地区迁走了。) 3)The candidate is constantly shifting his opinion about the problem.(这位竞选者在这个问题上不断改变他的观点。)exchange交换；exchange... for ... 用.......换......；alter(部分)修改。
102. Pack the cake in a strong box, or it might get _____ in the post.
A. splashed B. spilt C. crushed D. crashed
[答案] C. crushed.
[注释] crush压坏，压碎；弄皱；辗散；1)Don't crush this box; there are flowers inside.(不要把这个盒子压坏了，里面有鲜花。) 2)Her dress was crushed.(她的衣服弄皱了。) 3)The machine crushes wheat grain to make floor.(这台机器把麦粒辗成面粉。)splash溅，泼；split(中间)裂开；crash(向下)猛跌；（飞机）失事。
103. The thief _____ the papers all over the room while he was searching.
A. abandoned B. vanished C. scattered D. deserted
[答案] C. scattered.
[注释] scatter(=throw or put in various directions, or here and there)撒。abandon放弃，抛弃。desert遗弃（而离开）。vanish消亡，灭亡。本题句意是将小偷在搜寻钱时的情景，所以应选scattered(撒)。
104. Today, housework has been made much easier by electrical _____.
A. facilities B. appliances C. instruments D. equipment
[答案] B. appliances.
[注释] electric appliances电器用具，facilities公用设备。equipment设备,装备，是集合名词，指“设备”的总称，只有当数形式。instrument仪器。
105. The _____ of the trees in the water was very clear.
A. mirror B. sight C. reflection D. shadow
[答案] C. reflection.
[注释] reflection此处意为“映在水中的倒影”，而不是“影子”或“阴影”，故不能用shadow。其他选择均不合题意。
106. One _____ needed when making a cake is flour; another is sugar.
A. container B. ingredient C. content D. equivalent
[答案] B. ingredient.
[注释] ingredient(混合物的)成分。container容器，含量；内容（复数）。equivalent:相等物。
107. They have been waiting for many hours to see the singer, but the airplane must have been _____.
A. behind the times B. behind schedule
C. ahead of time D. in no time
[答案] B. behind schedule.
[注释]behind schedule(=late, behind time)晚点：The train is running behind schedule today.(=The train is not on time today.)behind the times(=using things not in style; still following old ways; old fashioned)过时，跟不上时代，落后：1)The store is behind the times.(=The store is old-fashioned; it looks as stores looked 40 years ago.) 2) Mary thinks her parents are behind the times because they still do the fox-trot and don't know any new dances.(=Mary's parents are old-fashioned in their dancings .) ahead of time提前： They have fulfilled their production plans ahead of time, in no time(=soon, quickly)立即，马上：I'll be back in no time to see you home.