_______cloning human embryos is not legal in many countries, some scientists are
题型：不详难度：来源：
_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.| A．While | B．When | C．Since | D．if only |
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答案
| A |
解析
试题分析：考查连词：A. While虽然,B. When当…时候，C. Since既然D. if only 但愿，句意：虽然克隆人类胚胎是违法的，但一些科学家已经在努力推进研究为了制造克隆的人类婴儿。选A。
点评：考查连词主要是弄清每个冠词本身的含义，做题时一定要根据上下文的逻辑关系选择。 |
举一反三
you understand this rule, you’ll have no further difficulty.| A．Until | B．Unless | C．Though | D．Once |
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___________there are many different types of food, some animals spend their lives eating only one type.| A．Since | B．Unless | C．Once | D．While |
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| You shouldn’t have failed the job interview. Why didn’t you do ___ the expert suggested? |
Your parents have given you all the facts _____ you can judge for yourself easily| A．even if | B．as if | C．such that | D．so that |
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—What do you think about the new teacher?
—________ the new teacher is an elegant lady, she can be extremely difficult to work with.| A．As if | B．As long as | C．Because | D．While |
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