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【单选题】
丙烯与氯气在高温下的反应为(    )。
A.
自由基加成反应    
B.
自由基取代反应
C.
亲电加成反应    
D.
亲核加成反应
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参考答案:
举一反三
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【单选题】听力原文: There was once a man in South America who had a parrot, a pet bird that could imitate human speech. The parrot was unique. There was no bird like him in the whole world. He could learn to say an...
A.
It looks like human being.
B.
It looks different from other birds.
C.
It could learn to say most of words.
D.
It could not imitate human speech.
【简答题】Once there was a parrot on sale in a pet store. It was a beautiful red and blue bird. It sat on a perch ( 横杆 ) in the middle of the store, so that everyone could see it when they came in. The owner wa...
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【简答题】Once there was a parrot on sale in a pet store. It was a beautiful red and blue bird. It sat on a perch in the middle of the store, so that everyone could see it when they came in. The owner was very ...
【判断题】现行汇率法采用单一汇率对资产、负债项目进行折算,相当于各项目乘上一个常数,因而计算简便。( )
A.
正确
B.
错误
【简答题】There was a bird in front of the classroom just now. (否定句) (一般疑问句) (肯、否定回答)
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