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2两题课外完成,开学备查;3、4两题完成后答案上传。 1. Copy the new words and expressions in Unit 2, Section A. 2. Prepare for the d i ctation for the new words and expressions. 3. Read through Text A and do the exercise of Getting the Message. 4. 阅读理解 Although the United States covers so much land and the land produces far more food than the present population needs , its people are by now almost entirely an urban society Less than a tenth of the people are engaged in agriculture and forestry( 林业 ) , and most of the rest live in or around towns , small and large . Here the traditional picture is changing : every small town may still be very like other small towns , and the typical small town may represent a widely accepted view of the country , but most Americans do not live in small towns any more . Half the population now lives in some thirty metropolitan areas(1arge cities with their suburbs 、 of more than a million people each—a larger proportion than in Germany or England , let alone France . The statistics( 统计 )of urban and rural population should be treated with caution because so many people who live in areas classified as rural travel by car to work in a nearby town each day . As the rush to live out of town continues . rural areas within reach of towns are gradually filled with houses , so that it is hard to say at what moment a piece of country becomes a suburb But more and more the typical American lives in a metropolitan rather than a small town environment . 1 . If now America has 250 million people . how many of them are engaged in agriculture and forestry? A . About 25 million . B . More than 25 million . C . Less than 25 million . D. Less than 225 million 2 . Which of the following four countries has the smallest proportion of people living in metropolitan areas? A . United States . B . Germany . C . France . D . England . 3 . What’s the meaning of the word“ metropolitan” in the middle of the passage? A .Of a large city with its suburbs . B . Of small and large towns . C . Of urban areas . D . Of rural areas . 4. According to the passage , what can we learn about small towns in the United States? A Most small towns become gradually crowded B . Small towns are still similar to each other . C. As the traditional picture is changing , towns are different . D. Small towns are turning into large cities 5 . Why is it hard to say when a piece of country becomes a suburb? A . Because they are the same . B . Because the rush takes place too quickly C . Because the process is gradual . D . Because more and more Americans live in metropolitan areas .
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【单选题】以下拟肾上腺素药物中含有2个手性碳原子的药物是
A.
盐酸克仑特罗
B.
盐酸麻黄碱
C.
硫酸沙丁胺醇
D.
盐酸可乐定
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【单选题】以下拟肾上腺素药物中含有 2 个手性碳原子的药物是( )
A.
盐酸多巴胺
B.
盐酸克仑特罗
C.
肾上腺素
D.
盐酸氯丙那林
E.
盐酸麻黄碱
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A.
DNA,RNA两种
B.
DNA
C.
RNA
D.
DNA或RNA一种核酸
【单选题】下列有关核酸的叙述,不正确的是
A.
核酸的基本组成单位是氨基酸
B.
核酸存在于细胞核和细胞质
【单选题】以下拟肾上腺素药物中含有2个手性碳原子的药物是
A.
盐酸克仑特罗
B.
盐酸麻黄碱
C.
盐酸多巴胺
D.
硫酸沙丁胺醇
【单选题】下列关于核酸的叙述正确的是()
A.
与DNA相比,RNA所特有的成分是核糖和胸腺嘧啶
B.
女性乳腺细胞中脱氧核糖核酸分子含有人的全部遗传信息
C.
病毒只含有一种核酸
D.
硝化细菌的遗传物质主要是脱氧核糖核酸
【单选题】下列有关核酸的叙述正确的是( )。
A.
核酸的分类是依据所含的含氮碱基是T还是  U
B.
核酸的基本单位是脱氧核苷酸
C.
鱼体内的遗传物质彻底水解后可得到脱氧核糖、磷酸和含氮碱基
D.
RNA含有脱氧核糖、磷酸和碱基
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A.
受力
B.
重复
C.
姿势
D.
心情
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