题目内容

He said he had ______ to tell the manager.

A. important something
B. important nothing
C. anything important
D. something important

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A. as fast as Tom, if not faster than
B. as fast as, if not faster than, Tom
C. as fast, if not faster, as Tom
D. faster, if not as fast as Tom

A. 基因突变
B. 连续传代
C. 不适应的培养条件
D. 不适宜的保藏条件

A. 合理的育种
B. 选用合适的培养基
C. 创造良好的培养条件
D. 控制传代的次数

A. 缺营养
B. 缺氧
C. 干燥
D. 低温
E. 添加保护剂