1. 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。

2. 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。

3. 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)。

4. 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。

5. 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。