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问题 选择题

酿制甘甜的葡萄美酒，主要利用（　　）

A．甲烷细菌

B．枯草杆菌

C．霉菌

D．酵母菌

答案

微生物的发酵在食品的制作中具有重要的作用，如酿酒时要用到酵母菌，在无氧的条件下，酵母菌能分解葡萄糖产生酒精和二氧化碳．可见D符合题意．

故选：D

句型转换

句型转换。

1. There are five books in my bag. (对画线部分提问)

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2. My sister often reads books in the evening. (对画线部分提问)

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3. Amy went to a park yesterday. (对画线部分提问)

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4. They bought some gifts for their new friends last Sunday. (变为一般疑问句，作否定回答)

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5. Sarah usually goes to school by bike. (变为否定句)

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问答题 简答题

用隔离开关进行哪些操作？
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