Task 1
Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.
All of us communicate with one another nonverbally, as well as with words. Most of the time we're not aware that we're doing it. We gesture with eyebrows or a hand, meet someone else's eyes and look away, shift positions in a chair. These actions we assume are random(随意的) and incidental. But researchers have discovered in recent years that there is a system to them almost as consistent and comprehensible (可充分了解的) as language.
Every culture has its own body language, and children understand its meanings along with spoken language. A Frenchman talks and moves in French. The way an Englishman crossed his legs is nothing like the way a male American does it. In talking, Americans are apt to end a statement with a droop(垂下) of the head or hand, a lowering of the eyelids(眼皮). They wind up(结束)a question with a lift of the hand, a tilt(倾斜) of the chin or a widening of the eyes. With a future-tense verb they often gesture with a forward movement.
There are regional idioms too: an expert can sometimes pick out a native of Wisconsin just by the way he uses his eyebrows during conversation. Your sex, ethnic(种族的) background, social class and personal style. all influence your body language. Nevertheless, you move and gesture within the American idiom.
Communications between human beings would be just that dull if it were all done with words. But actually, words are often the smallest part of it.
Which of the following is true according to the passage?
A.Every time people use body language, they realize it.
B.Only some people may use body language in communication.
C.Researchers think the body language people use is random and incidental.
D.Sometimes people may not realize that they are using body language.
第4题
A.MAC地址只有高24位固定
B.32位IP组播地址空间映射到MAC地址的低32位
C.IP组播地址中低28位空间映射到MAC地址的低28位
D.IP组播地址中低23位映射到MAC地址的低23位
第5题
A.组播MAC的地址的高24bit为0x01005f,第25位固定为1,MAC地址的低23bit组播IP地址的低23bit
B.1个组播MAC地址对应32个IP组播地址
C.组播MAC地址的作用是在链路层上标识属于同一组播组的接收者
D.1个组播MAC地址唯一对应一个IP组播地址
第6题
以下关于MAC组播地址的说法正确的是
A.组播MAC地址前六个十六进制位是0x01005e
B.在以太网中,第3层的IP组播地址信息的全部28位映射进入24位的第2层MAC地址空间
C.MAC组播地址范围由IEEE指定
D.组播MAC地址由23位组成
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