实验室确定某种细菌的培养方法应该采用下列哪种培养基
A. 基础培养基
B. 鉴别培养基
C. 选择培养基
D. 营养培养基
E. 液体培养基
基础培养基中由下面哪些物质组成①蛋白胨 ②肉浸膏 ③NaCl ④水
A. ①②④
B. ①③④
C. ①②③④
D. ①②③
E. ②③④
下列描述微生物的特征中，哪项不是所有微生物的共同特征
A. 个体微小
B. 分布广
C. 种类繁多
D. 可无致病性
E. 只能在活细胞中存活
According to paragraph 9, why is it important for children to be close to nature?
A. This can help know the importance of protecting the environment.
B. This can help them to be more independent.
C. This can arouse their great interest in nature.
D. This can motivate them to study hard in school.
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