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【单选题】
UML中主要有依赖关系、泛化关系、关联关系、实现关系等关系。其中，（ ）是类元之间的语义关系，其中的一个类元指定了由另一个类元保证执行的契约。A.
依赖关系
B.
泛化关系
C.
关联关系
D.
实现关系
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举一反三
【单选题】He doesn't______into self-pity because of his job as a trash man instead, he feels proud of it as he thinks it is an essential task.
A.
withdraw
B.
retreat
C.
retire
D.
reverse
【单选题】听力原文：W: Sit down please, Mr. Johnson. M: Nice to meet you, ma'am. W: I have read your letter here. You seem to have done very well in school. Can you tell me something about your schoolwork? M: As you...
A.
history
B.
geography
C.
mathematics
D.
art
【简答题】长期阴雨天，农田积水，若不及时排水，淹水的旱生作物就会很快死亡，是由于植物根的______作用无法进行的缘故；放置时间长的萝卜会空心，就是由于萝卜的呼吸作用分解了大量的______的缘故。
【单选题】听力原文：W: Sit down please, Mr. Johnson. M: Thank you. W: I have read your application letter here. You seem to have done very well in school. Can you tell me something about your schoolwork? M: As you c...
A.
Talking with his teacher about his schoolwork.
B.
Preparing software.
C.
Talking to an interviewer.
D.
Writing programs.
【多选题】汇编语言相对于C语言对8051进行编程时的缺点有( )。
A.
与CPU硬件结构紧密相关，CPU不同汇编也就不同
B.
汇编语言不能良好移植
C.
用汇编语言进行编程要必须了解CPU的结构与性能
D.
汇编语言的执行效率较差
【单选题】In fact Mrs. Smith ______what the man had said.
A.
understood
B.
was puzzled about
C.
was glad to hear
D.
didn’t understand
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