问题 选择题

类推的思维方法在化学学习与研究中常会产生错误的结论。因此类推出的结论最终要经过实践的检验才能知道其正确与否。以下几种类推结论中正确的是(   )

A.金属镁失火不能用二氧化碳灭火器扑灭;金属钠失火也不能用二氧化碳灭火

B.加热Ag2O可以得到单质银;加热CuO也可制取单质铜

C.工业上用电解熔融MgCl2的方法制取金属镁;故也可用电解熔融AlCl3的方法制取金属铝

D.Al和S直接化合可以得到Al2S3;Fe与S直接化合也可得到Fe2S3

答案

答案:A

A项,由于钠比镁活泼,镁能与CO2反应,则钠也能与CO2反应;B项,CuO受热难以分解,应用热还原法制取铜;C项,AlCl3是共价化合物,熔融时不发生电离,不能用电解熔融AlCl3的方法制取单质铝;D项,由于S的氧化能力比较弱,与Fe反应生成FeS,与Al反应生成Al2S3,故选A项

单项选择题 配伍题
填空题

Nonverbal communication is hugely important: in any interaction with others, its importance is multiplied across cultures. This is because we tend to look for nonverbal cues when verbal messages are unclear or ambiguous, as they are more likely to be across cultures. (41) __________.

Low-context cultures like the United States and Canada tend to give relatively less emphasis to nonverbal communication. This does not mean that nonverbal communication does not happen, or that it is unimportant, but that people in these settings tend to place less importance on it than on the literal meanings of words themselves. In high-context settings such as Japan or Colombia, understanding the nonverbal components of communication is relatively more important to receiving the intended meaning of the communication as a whole.

(42) __________. For instance, it may be more socially acceptable in some settings in the United States for women to show fear, but not anger, and for men to display anger, but not fear. At the same time, interpretation of facial expressions across cultures is difficult. In China and Japan, for example, a facial expression that would be recognized around the world as conveying happiness may actually express anger or mask sadness, both of which are unacceptable to show overtly.

(43) __________.For a Westerner who understands smiles to mean friendliness and happiness, this smile may seem out of place and even cold, under the circumstances. Even though some facial expressions may be similar across cultures, their interpretations remain culture specific. It is important to understand something about cultural starting-points and values in order to interpret emotions expressed in cross-cultural interactions.

(44) __________. In a comparison of North American and French children on a beach, a researcher noticed that the French children tended to stay in a relatively small space near their parents, while US children ranged up and down a large area of the beach.

(45) __________.

These examples of differences related to nonverbal communication are only the tip of the iceberg. Careful observation, ongoing study from a variety of sources, and cultivating relationships across cultures will all help develop the cultural fluency to work effectively with nonverbal communication differences.

[A] These differences of interpretation may lead to conflict. Suppose a Japanese person is explaining her absence from negotiations due to a death in her family. She may do so with a smile, based on her cultural belief that it is not appropriate to inflict the pain of grief on others.

[B] Another variable across cultures has to do with ways of relating to space. Crossing cultures, we encounter very different ideas about polite space for conversations and negotiations. North Americans tend to prefer a large amount of space, perhaps because they are surrounded by it in their homes and countryside. Europeans tend to stand more closely with each other when talking, and are accustomed to smaller personal spaces.

[C] Americans are serious about standing in lines, in accordance with their beliefs in democracy and the principle of "first come, first served." The French, on the other hand, have a practice of line jumping, that irritates many British and U S Americans.

[D] Since nonverbal behavior arises from our cultural common sense, we use different systems of understanding gestures, posture, silence, spatial relations, emotional expression, touch, ’physical appearance, and other nonverbal cues. Cultures also attribute different degrees of importance to verbal and nonverbal behavior.

[E] The difficulty with space preferences is not that they exist, but the judgments that get attached to them. If someone is accustomed to standing or sitting very close when they are talking with another, they may see the other’s attempt to create more space as evidence of coldness, or a lack of interest.

[F] It is said that a German executive working in the United States became so upset with visitors to his office moving the guest chair to suit themselves that he had it bolted to the floor.

[G] Some elements of nonverbal communication are consistent across cultures. For example, research has shown that the emotions of enjoyment, anger, fear, sadness, disgust, and surprise are expressed in similar ways by people around the world. Differences surface with respect to which emotions are acceptable to display in various cultural settings, and by whom.

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