2. 考研
  3. Lots of creatures already reproduce without sex. Since the birth of Louise Brown, the first test-tube baby, in 1978, (1)_____ of

Lots of creatures already reproduce without sex. Since the birth of Louise Brown, the first test-tube baby, in 1978, (1)_____ of

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问题     Lots of creatures already reproduce without sex. Since the birth of Louise Brown, the first test-tube baby, in 1978, (1)_____ of human beings (2)_____ in laboratory glassware rather than in bed.
    If human cloning becomes possible—and since the birth of a sheep called Dolly, (3)_____ doubt that it will be feasible to clone a person by 2025—even the link between sex organs and reproduction (4)_____. You will then be able to take a cutting from your body and grow a new person, (5)_____ you were a willow tree.
(6)_____, we have already divorced sex from reproduction. In the 1960s, the contraceptive pill freed women to enjoy sex for its own sake. (7)_____, greater tolerance of homosexuality signaled society’s acceptance of non-reproductive sex of another sort. These changes are only continuations of a (8)_____ that started perhaps a million years ago.
    Human beings (9)_____ the interest in infertile, social sex with a few other species: dolphins, apes and some birds. But (10)_____ sex is too good for human beings to (11)_____, more and more people will abandon it as a (12)_____ of reproduction.
    In the modern world, you can (13)_____ have sex and parenthood without suffering the bit (14)_____. Some Hollywood actresses (15)_____ the urge for mothering by electing to adopt children (16)_____ spoil their figures (as they see it) by childbearing. For people as beautiful as this, the temptation to (17)_____ a clone (reared in a surrogate womb) could one day be (18)_____.
    However, human cloning and designer babies are probably not (19)_____. Even assuming that the procedures are judged safe and efficient in farm animals, still a long way off, they will be heavily (20)_____, if not banned, by many governments for human beings.

选项 A、has been conceived
B、had been conceived
C、have been conceived
D、were conceived
答案C
解析 have been conceived in laboratory已经在实验室被创造出来。注意此处需要一个完成时态的被动语态。
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考研英语一

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