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问题 选择题

夏天，食品容易发馊，引起食品腐败的主要原因是[ ]

A．天气炎热，食品中的水分蒸发过快

B．光照时间长，空气干燥

C．温度较高，食品中的细菌、真菌生长繁殖快

D．昼夜温差大，食品中有机物分解慢

答案

答案：C

选择题

已知{an}为等差数列，且有a2+a6+a7+a8+a12=15，则S13=（　　）

A．39

B．45

C．3

D．91
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填空题

根据下面对话中的情境，在每个空白处填入一个适当的语句，使对话恢复完整。

A: Hi, Linda. You look sad. 小题1:.                            ?

B: Well, I love music, but my mother doesn’t allow me to listen to it.

A: 小题2:.                                            ?

B: Because she thinks listening to music is not good for my study.

A: 小题3:.                                   . I also love music. It makes me relaxed and helps me study better.

B: Right. Music brings me much, too. But how can I solve my problem? Can you give me some advice?

A: Of course. 小题4:.                                    ?

B: No, I don’t often talk with her. We often argue.

A: I think communicating with each other is a better way. You can have a good talk with your mother.

B: 小题5:.                              . Thanks for your advice.
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