1) A college degree is important. 2) Having a college degree has many positive effects on a person's life. of the above two sentences, sentence 2) is a better topic sentence.
A.
正确
B.
错误
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【单选题】芳香族化合物A的分子式为C 7 H 6 O 2 ,将它与NaHCO 3 溶液混合微热,有酸性气体产生,那么包括A在内,属于芳香族化合物的同分异构体数目是