正确答案: A

正确

题目：嫁接可克服种子繁殖不能保存亲代优良品质的缺点。( )

解析：A

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举一反三的答案和解析：

[单选题]听下面一段对话，回答第14至第17四个小题。第14题：Why is the woman asking for leave?

She wants to spend some time with her parents.

[单选题]According to the text, what is the major cause of the flooding spam? 【 】

More advertisers begin to promote sales through spam.