正确答案: AE

距 副萼

题目：萝蘼科植物花较特化，具多种特殊构造，但并无( )。

解析：AE

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举一反三的答案和解析：

[单选题]39 A taking off B． fixing C looking at D winding

looking at

[单选题]Teachers recommend parents their children under 12to ride bicycles to school for safety.

not allow

[单选题]下列结构中，不属于苔类配子体世代(染色体为n)的是( )。

受精卵

[单选题]

realize

[单选题]Life is like a ling race we compete with others to go beyond ourselves.

where

[单选题]

cheering

[单选题]57____

switch

解析：

switch topics（变换标题）属于修改作品的一部分。动词discuss（讨论）、exhaust（汲干、使筋疲力尽）、cover（覆盖、包含）都不符题意。本题难度适中。

[单选题]What did the scientists do to find out if the e-nose worked?

They made tests on damaged and healthy leaves.