问题 选择题

如图是关于遗传知识的概念图,图中代码1、2、3、4依次为

A.染色体、双螺旋结构、遗传信息、基因

B.染色体、双螺旋结构、基因、遗传信息

C.细胞核、染色体、基因、遗传信息

D.细胞核、基因、染色体、遗传信息

答案

答案:A

题目分析:细胞核中容易被碱性染料染成深色的是染色体,它是由DNA和蛋白质组成的,一条染色体上包含一个DNA分子,DNA是主要的遗传物质,DNA分子是由两条长链状盘旋而成的规则的双螺旋结构,基因是染色体上具有控制生物性状的DNA片段。

点评:此题为基础知识题,解答此题的关键是熟记基因是染色体上具有控制生物性状的DNA片段,是生物体遗传物质的基本单位。

阅读理解

任务型阅读

Do you like chocolate? Maybe most people do. A box of it can be a great gift. Buy one for a friend and give it as a surprise. See how happy that person gets.

Say you’ve just got a box of chocolate. Which piece would you pick first? A man has studied people’s choices(选择). He says they tell something about the person. What if you choose a round piece? You are a person who likes to go to the party. What if you choose an oval(椭圆形的)shape? (1)You are a person who likes to make things. Picking a square shape shows something else: The person is honest and truthful, and you can depend on(依靠)him or her.

(2)What kind of ________do you_______? Maybe you pick milk chocolate. This shows you have warm feelings about the past. Dark chocolate means something else. A person who chooses it looks toward the future. What about white chocolate? Would you choose it? If so, you may find it hard to make up your mind. Some people like chocolate with nuts(果仁). These are people who like to help others.

Different choices may show different characters(性格). Do you believe these ideas? Can candy tell all these things? It doesn’t really matter. There is one sure thing about eaters of chocolate. They eat it because they like it.

小题1:将(1)句译成中文:_____________________________________________________________

小题2:在(2)句的空白处填入适当的词使句意完整、上下文通顺:_________ _________

小题3:回答问题:What may you like to think of if you enjoy eating milk chocolate?

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小题4:在文中找出与You enjoy taking part in parties.意思相近的句子:

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小题5:在文中找出最能表达该短文主题的句子:

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单项选择题