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问题 选择题

下列关于人类对细菌真菌的利用，对应有误的是

A．酵母菌—制作面包

B．醋酸菌—制作泡菜

C．乳酸菌—制作酸奶

D．甲烷菌—生产沼气

答案

答案：B

题目分析：酵母菌可以用于制作面包、馒头和酿酒，醋酸菌用于制作醋，乳酸菌制作酸奶、泡菜，甲烷菌制作沼气，故选B。

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例: Sarah is 15 years old. Amy is 14 years old.      

      Sarah is one year older than Amy. Amy is one year younger than Sarah.

1. John is 159 cm tall. Mike is 162cm tall.

                                                                                

2. Liu Yun is 12 years old. Chen Jie  is 14 years old. 

                                                                                

3. Lucy is 42 kg and Mary is 43 kg.

                                                                                

4. I am 40 kg and my brother is 38 kg.

                                                                                 

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选择题

若2（x-3）+a（x+6）=1是关于x的一元一次方程，则（　　）

A．a≠-2

B．a≠0

C．a≠2

D．a为任意数
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