题目内容
There are two types of twins: identical (同性的) and non-identical twins. Identical twins are formed 1 a single egg in the mother's body which 2 to form two separate babies. Identical twins look the same, and are often 3 by their parents in clothes of the same colors. It is often 4 to tell identical twins from each other, even when they are standing 5 . Non-identical twins come into being when the mother 6 two separate eggs at the same time, both of 7 grow to form babies. 8 case the twins look like ordinary brothers and sisters and are easy to tell one from 9 .
In the 1970s and 1980s a scientist did some 10 into twins in the USA．He invited many 11 of identical twins to the university and asked them to 12 a week of tests. He was particularly 13 adopted (被收养的) twins who had been separated at birth. He 14 give the twins different kinds of tests to 15 their speed of thinking, their speech, their memory (记忆), 16 they saw and heard different things, and so on. 17 he found separate twins preferred clothes of the same color. They even used shaving (修面的) soaps of 18 kind.
There is a third type of twins. 19 , it is a very unusual one. Twins which are joined together at birth are known in western countries 20 Siamese twins.
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解析：
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1．from来自，同性双胞胎来自母体内一个卵细胞． 2．divide…把……分为几部分，separate隔开（离），该处是分为两部分． 3．dress sb.的被动语态为sb．be dressed． 4．difficult很难，而hardly几乎不． 5．side by side肩并肩地，all the same都一样． 6．生产两个不同的卵细胞，故用动词produce． 7．选A时句首应加上and（并列句），此处关系代词which正确． 8．in this case在这种情况下． 9．the other表示两个中的另一个． 10．do some resarch做研究． 11．pair两个同类的人或物；couple（两个但不一定是同类）：a couple ofsocks两只袜子，但不一定配对． 12．join加入某一个组织，take part in参加某项活动． 13．对一出生就被不同家庭收养的双胞胎感兴趣，其余项不正确． 14．本句为过去将来时，谓语动词应用would． 15．study研究，learn学习，discover揭露，发现． 16．in the way用这个方法． 17．again and again不断地，比again更具有说服力． 18．of a kind表示同类的． 19．如用but必须去掉其后逗号，however然而． 20．be known as作为……而出名． |
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