搜题请搜索小程序“爱下问搜题”
问题 选择题

下列关于果酒和果醋制作的叙述，错误的是 [ ]

A．制作果酒时瓶口需密闭，而制作果醋时中断通氧可能会引起醋酸菌死亡

B．在发酵之前应用体积分数为70%的酒精对发酵瓶消毒

C．在变酸的果酒的表面观察到的菌膜可能是醋酸菌在液面大量繁殖形成的

D．温度对酵母菌酒精发酵的影响很大，而对醋酸菌的发酵影响不大

答案

答案：D

单项选择题

氨基酸通过下列哪种化学键与tRNA进行特异结合（）

A.糖苷键

B.酯键

C.酰胺键

D.磷酸酯键

E.氢键
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写作题

假如你叫小华，下面是你收到的你祖父从美国的来信。请你根据来信的内容写一封回信。（要求：100词左右。）

September 15,2005

Dear Xiaohua,

I had a letter from your mother a few days ago ,but she didn’t give me much news about you . She said you went on an ecology summer camp. When I heard that you had seen a snake ,I was worried .I hope someone killed it ! I was sorry to hear that you had hurt your knee. How did that happen? I hope it is better now.

I know your birthday is coming soon ,so I am enclosing（附上）a check for you .Write soon and tell me what you decide to do with the money .I want you to spend it on something nice.

With lots of love,

Yours，

Grandpa

Dear Grandpa,

                                                                            

                                                                            

                                                                            

                                                                            

Yours,

Xiaohua
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