[音频]Who has the greatest positive influence on teenagers?
A. Closest friends.
B. Political leaders.
C. Fathers.
D. Mothers.
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[音频]What are the stories in the book mainly about?
A. Female heroes.
B. Female leaders.
C. Female artists.
D. Female rebels.
[音频]Why was Tilly Smith awarded Child of the Year?
A. She saved people's lives in Thailand.
B. She wrote a report about tsunamis.
C. She won a contest in geography.
D. She helped to clean up the beach.
甲企业为增值税一般纳税人，4月接受某烟厂委托加工烟丝，甲企业自行提供烟叶的成本为35000元，代垫辅助材料2000元，发生加工支出4000元。甲企业应代收代缴多少消费税？
三羧酸循环的第一步反应产物是：
A. 柠檬酸
B. 草酰乙酸
C. 乙酰CoA
D. 二氧化碳和水
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