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【单选题】
Faster Effective Reading A higher reading rate, with no loss of comprehension, will help you in other subjects as well as in English, and the general principles apply to any language. Naturally, you will not read every book at the same speed. You would expect to read a newspaper, for example, much more rapidly than a physics or economics textbook but you can raise your average reading speed over the whole range of materials you wish to cover so that the percentage (百分比) gained will be the same whatever kind of reading you are concerned with. The reading passages which follow are all of an average level of difficulty for your stage of instruction. They are all about five hundred words long. They are about topics of general interest which do not require a great deal of specialized knowledge. Thus they fall between the kind of reading you might find in your textbooks and the much less demanding kind you will find in a newspaper or light novel. If you read this kind of English, with understanding at, say, four hundred words per minute, you might drop to two hundred or two hundred and fifty. Perhaps you would like to know what reading speeds are common among native English-speaking university students and how those speeds can be improved. Tests in Minnesota, U. S. A, for example, have shown that students without special training can read English of average difficulty, for example, Tolstoy's War and Peace in translation, at speeds of between 240 and 250 words per minute with about seventy percent comprehension. Students in Minnesota claim that after twelve half-hour lessons, once a week, the reading speed can be increased, with no loss of comprehension, to around five hundred words per minute. According to the passage, the purpose of effective reading with higher speed is most likely to help you
A.
only in your reading of a physics textbook
B.
improve your understanding of an economics textbook
C.
not only in your language study but also in other subjects
D.
choose the suitable materials for you to practice reading
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【单选题】下列叙述与贝诺酯不相符的是
A.
为前体药物
B.
对胃黏膜刺激性大
C.
环氧化酶抑制剂
D.
水解产物与三氯化铁显紫堇色
E.
结构中具有潜在的芳香第一胺
【简答题】美国诺尔斯、夏普雷斯及日本野依良治三位化学家在发现和合成手性催化剂方面有卓越贡献,被授予2001年诺贝尔化学奖,以表彰他们发现手性分子可以用来加速并控制化学反应的创造性工作。含手性碳原子的物质通常具有不同的光学特性(称为光学活性)。 (1)根据报道,最新合成的有机物A 具有光学活性,若要使A通过反应失去光学活性,则发生的反应类型不可能是________(填字母) A.酯化反应 B.水解反应 C.氧...
【判断题】在私有继承中,基类中所有成员在派生类内是不可访问的。
A.
正确
B.
错误
【判断题】具有较高债务偿还需要的公司,一定会减少股利的支付。
A.
正确
B.
错误
【单选题】下列叙述与贝诺酯不相符的是( )
A.
为前体药物
B.
结构中具有潜在的芳香第一胺
C.
水解产物与三氯化铁显紫堇色
D.
对胃黏膜的刺激性大
E.
环氧化醇抑制剂
【判断题】具有较高债务偿还需要的公司,一定会减少股利的支付
A.
正确
B.
错误
【单选题】下列叙述与贝诺酯不相符的是
A.
为前体药物
B.
环氧化酶抑制剂
C.
对胃黏膜刺激性大
D.
水解产物与三氯化铁显紫堇色
E.
结构中具有潜在的芳香第一胺
【判断题】在私有继承中,基类中所有成员对派生类都是不可见的。
A.
正确
B.
错误
【简答题】化学家利用钯(Pd)作催化剂,将有机化合物进行“裁剪”“缝合”,创造出具有特殊功能的新物质而荣获2010年诺贝尔化学奖。赫克反应(Heck反应)的通式可表示为: (R—X中的R通常是不饱和烃基或苯环;R′CH=CH 2 通常是丙烯酸酯或丙烯腈CH 2 =CH—CN等): 现有A、B、C、D等有机化合物有如下转化关系(部分反应条件省略) 请回答下列问题: (1)反应Ⅰ的化学方程式为_________...
【简答题】八年级的晓明同学曾经在实验室窗外看到化学老师做过这样的实验:用一种固体跟一种液体在不加任何条件的情况下接触即可发生化学反应,并且生成一种无色的气体。你也已经学了一年的化学,相信你能帮助晓明解决疑惑。请进实验室! 【走进实验室】下列仪器可供选择并且能按具体实验要求配套使用: 【提出问题】固体是什么?液体是什么?生成的气体是什么?如何检验呢? 【猜想与假设】可能是常见的氢气或氧气或者二氧化碳。 【查阅...
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