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【单选题】
根据以上内容，回答下列各题。 Passage Four Ever since humans have live on the earth，they have made use ofvariou8 forms of commu-nication．Generally，this expression of thoughts and feelings has been in the form. oforalspeech. When there is a language barrier，communicationis accomplished through sign lan．guage in which motionsstand for letters，words，andideas．Tourists and the people unable to hear or speakhave had to resort to this form. of expression．Many ofthese symbols of whole words are very vivid and exact and Can be usedinternationally；spelling，however，cannot． Bodylanguage transmits ideas or thoughts by certain actions，either intentionally orunin．tentionally.A wink can be a way of indicating thatthe part is only joking．A nod signifies ap-proval，while shaking the head indicates a negative reaction． Other forms of nonlinguistic language can be found in Braille(a system of raisedDotsreadwith the fingertips)，signal flags，Morse code，and smoke signals，Road maps and picture signsalso guide，warn，and instructpeople．While language is the most common form. ofcom-munication，other systems and techniques alsoexpress human thoughts and feelings． Which of the following statements bestsummarizes this passage?A.
When language is a barrier，people will find other forms of communication．
B.
Everybody uses only oneform. of communication．
C.
Nonlinguistic language isinvaluable to foreigners．
D.
Although other forms，apart from language of communication exist，theyare of little value．
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【单选题】Which of the following are NOT the objectives of the introduction? (Just select the correct answer(s). There may be only one.)
A.
To arouse the attention and interest of the audience.
B.
To establish the credibility of the speaker.
C.
To build up a good relationship with the audience.
D.
To reveal everything the speaker wants to say in the speech.
【多选题】关于机械波的说法正确的是( )
A.
相邻的质点要相互做功
B.
纵波的质点可以随波迁移，而横波的质点不能
C.
振源开始时怎样振动，其他质点开始时就怎样振动
D.
波中各质点振动频率是相同的
【单选题】下列关于机械波的说法正确的是()
A.
有机械振动就有机械波
B.
机械波向右传播时右方的质点先振动
C.
机械波是传递能量的一种方式
D.
介质中的质点不随波迁移，只在平衡位置附近垂直于传播方向振动
【简答题】Listen to the beginning of each sentence. Circle the correct completion(s). There may be more than one correct answer. Select ALL the correct answers:
【简答题】S7-200PLC共有 个 定时 器,其中 的分辨率是 100ms.
【多选题】( 多选 ) 关于机械波的说法正确的是 ( )
A.
．相邻的质点要相互做功
B.
．机械波在真空中也能传播
C.
．波源开始时怎样振动，其他质点开始时就怎样振动
D.
．除波源外，波中各质点都做受迫振动
【单选题】Listen to six short dialogues and select the correct answer(s) to each question. 1. What is public relations?
A.
Public relations is to manage the relationship of an organization.
B.
Public relations is to manage the relationship and related customers.
C.
Public relations is to conduct relationships between an organization and its publics.
D.
Public relations is to conduct relationships of different organizations.
【单选题】以下关于机械波的说法正确的是（ ）
A.
机械波在传输过程中，频率有可能发生变化
B.
声波在空气里的传输速度比其在水中传输的要快
C.
机械波传播过程中，参与振动的介质并不传播
D.
机械波的周期与波源振动周期不相等
【单选题】Select the one of the following statements that is NOT CORRECT :
A.
Protein folding is assisted by intervention of specialized auxiliary proteins called chaperone.
B.
Protein folding tends to be modular, with areas of local secondary structure forming first, then coa
C.
Protein folding is driven first and foremost by the thermodynamics of the water molecules surroundin
D.
The formation of S-S bond in a mature protein is facilitated by the enzyme protein disulfide isomera
E.
Only a few unusual proteins, such as collagen, require posttranslational processing by partial proteolysis to attain their mature conformation.
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