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问题 单项选择题

预收账款属于会计要素中的（）。

A.资产

B.负债

C.收入

D.利润

答案

参考答案：B

单项选择题

QRS波代表哪部分心脏兴奋产生的电活动（）。

A.心房

B.心室

C.房室结

D.希氏束

E.浦肯野纤维
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单项选择题

Passage Three

How do songbirds learn their complex vocalizations a. They inherited by their parents. b. They have this naturally encoded in their genes. c. They learn by listening to others of their kind. d. They learn by listening to other kinds of birds.
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