1. The destruction an earthquake causes depends on its ______ and duration, or the amount of shaking that occurs.

　　A. altitude B. magnitude C. multitude D. aptitude

　　2. The ______ choice for a consumer, therefore, is the choice among the available ones that will enable him or her to maximize utility.

　　A. optimal B. optional C. optical D. optimistic

　　3. Mrs. Smith ______ tears when she heard her daughter had died in the road accident.

　　A. broke in B. broke up C. broke through D. broke into

　　4. A good friend is one who will ___ you when you are in trouble.

　　A. stand for B. stand by C. stand up to D. stand up with

　　5. When Mr. Smith retires, he will ___ his business to his son.

　　A. take over B. think over C. hand over D. get over

　　答案与解析

　　1. [B]

　　解析：altitude 高度，海拔; magnitude 重大，巨大;量级; multitude 大量，众多;aptitude天资, 智能。

　　2. [A]

　　解析：optimal 最佳的，最理想的;optional 可选择的，随意的;optical 视力的，光学的; optimistic 乐观的。

　　3. [D]

　　解析：break in 非法闯入;打断，插嘴;break up 打碎，破碎;break through 突围，突破; break into非法闯入，强行进入;break into tears是习惯搭配，意为“突然放声大哭”。

　　4. [B]

　　解析：stand for 代表，象征;stand by站在…一边，支持;stand up to 勇敢地面对，抵抗;经得起，顶得住;stand up with这个搭配不存在。

　　5. [C]

　　解析：take over 接收，接管;承袭，借用;think over 仔细考虑;hand over 交出，移交;get over 从(疾病、失望等)中恢复过来;克服，解决(问题等)。