Studies will be needed to see if the medicine has any ______ on the disease.?xml:namespace>
A. wealth
B. effect
C. price
D. market
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Something is wrong ______ my radio. Can you help fix it ??xml:namespace>
A. for
B. of
C. on
D. with
Many artists find it hard to ______ a living from art alone.?xml:namespace>
A. do
B. make
C. have
D. take?xml:namespace>
CH3CH=CH2 + Cl2 + H2O 的主要产物为
A. CH3CHClCH2Cl + CH3CHClCH2OH
B. CH3CHOHCH2Cl + CH3CHClCH2Cl
CH3CHClCH3+ CH3CHClCH2OH
D. CH3CHClCH2Cl
烯烃的亲电加成属离子型反应A. 正确B. 错误
A. 对
B. 错
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