单项选择题

爬山虎、栝楼的地上茎类型为

A．缠绕茎
B．攀缘茎
C．直立茎
D．匍匐茎
E．平卧茎

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单项选择题

图示结构影响线的纵标为:
A、AB、BC段纵标不为零。
B、BC、CD段纵标不为零。
C、AB、BC段纵标为零。
D、BC、CD段纵标为零。

单项选择题

Using DNA technology, the FDA traced the exact type of salmonella back to a company called Peanut Corporation of America, that was likely not diligent enough in its testing and cleanliness. The company has since gone out of business. ( Choose the correct definition of Red Word)
A、necessary because a law or someone in authority says you must
B、being an essential part of something
C、hardworking in a careful and thorough way
D、dirty or harmful because of dirt, chemicals, or radiation