Alan ______ singing. He likes to listen_爱下问搜题

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问题选择题

Alan ______ singing. He likes to listen to music.[ ]

A. is good at

B. is good with

C. are good to

D. good at

答案

答案：A

单项选择题

五行学说中“火”的特性是()

A．从草

B．炎上

C．稼穑

D．曲直

E．润下

问答题

设f(x)为非负连续函数，且

,求f(x)在[*]上的平均值．