问题 不定项选择题

在KIO3、KHSO3的酸性混合溶液中加入少量KI和淀粉,不停地搅拌,有下列反应发生:

①IO3-+5I-+ 6H+==3I2+3H2O;

②I2+2HSO3-+H2O==2I-+2SO42-+4H+

当反应进行到15min时,溶液突然变为蓝色,随之又很快消失。这一反应被称做时钟反应,有人用它来解释生物钟现象。下列有关说法不正确的是 [ ]

A.在整个反应过程中,起催化作用的物质是KI

B.上述两个反应中,反应速率较快的是②

C.时钟反应的快慢由反应②决定

D.“溶液突然变为蓝色,随之又很快消失”这一现象与①②的反应速率有关

答案

答案:C

阅读理解

阅读下面的短文,并根据短文后的要求答题(请注意问题后的词数要求,并将答案写在二卷答题纸上)。

[1] What does a successful language learner do? Language learning research shows that successful language learners are similar in many ways.

[2] First of all, successful language learners are independent learners. They do not depend on the book or the teacher. Instead of waiting for teachers to explain, they try to find the patterns and the rules for themselves. They are good guessers who look for clues and form their own conclusions.

[3] Secondly, successful language learning is active learning. Therefore, successful learners do not wait for a chance to use the language but                . They find people who speak the language and they ask these people to correct them when they make a mistake. They will try anything to communicate. They are not afraid to repeat what they hear or to say strange things. They are willing to make mistakes and try again. When communication is difficult, they can accept information that is inexact or incomplete. It is more important for them to learn to think in the language than to know the meaning of every word.

[4] Finally, successful language learners are learners with a purpose. They want to learn the language because they are interested in the language.

[5] What kind of language learners are you? If you are a successful language learner, you have probably been learning independently, actively and purposefully. On the other hand, if your language learning has been less than successful, you might do well to try some of the techniques above.

小题1: What is the main idea of the text? (Please answer within 10 words.)

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小题2: Which sentence in the text can be replaced by the following one?

They make efforts to seek their own ways of learning rather than wait for explanations from their teachers.

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小题3: Please fill in the blank in Paragraph 3 with proper words or phrases to complete the sentence. (Please answer within 8 words)

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小题4: If you want to be a successful language learner, what should you do? (Please answer within 20 words)

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小题5: Translate the underlined sentence in Paragraph 3 into Chinese.

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选择题