You should it carefully before a composition．( )A．consider, writeB．consider, writingC．considering, writing 题目和参考答案——青夏教育精英家教网—

题目内容

18．You should ______ it carefully before ______ a composition．（　　）

	A．	consider； write		B．	consider； writing
	C．	considering； writing

分析在写作文之前，你应该认真地考虑．

解答答案：B 英语中，consider译为考虑，write译为写，should+do sth译为应该做某事，后应该跟动词原形；before+doing sth译为在做某事之前，before为介词，所以后面跟动名词．根据句中的关键词should和before，故选择B．

点评本题考查的是学生们对于英语中动词的掌握，要求他们掌握其词义和一些固定搭配，正确理解句意．

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On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole "map" of the human body: DNA. DNA is something that everybody has, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.

People have been trying to understand the human body for a long time. In 1860, Gregor Mendel discovered a special reason why we look the same as other people in our family. It is because of small things named "genes" in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are real messages written in the DNA with a special language.

In 1961, Marshall Nirenberg and Johann Matthaei found a message in DNA showing how DNA tells the cell(细胞)to build its parts. Scientists have now found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one "word" means, we can help save more people from several illnesses.

Most people hope that this will help make better medicine and help sick people. Other people worry that when people begin to know more words and find out lots of other information, we might use it in a wrong way, just to make people more attractive, or stop sick people from getting jobs. Man would have to meet a lot of trouble if DNA technology(技术)wasn't limited(限制)in use.

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A. In 2000. B. In 1953. C. In 1961. D. In 1860.

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B. A new illness.

C. A message of DNA.

D. The language of DNA.

3.What can we do if we understand some "words" of the language inside the body?

A. Make people get new jobs.

B. Make medicine for illnesses.

C. Make maps of human.

D. Make people less attractive.