正确答案: A

蕊喙

题目：兰科植物花具2枚雄蕊时，则无( )。

解析：A

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举一反三的答案和解析：

[单选题]

B． before C． until D． while

whenB． before

[单选题]The underlined phrase in paragraph 3 most probably means _____________.

formed an idea for

解析：【解析】词义猜测题。上下句是Some…Other…句式，while we conjured up our designs的对应部分是while deep in thought，可见conjured up的意思是“思考，想象”，故选A。

[单选题]论文的关键词对内容有着提纲挈领的作用。有一篇评价某历史人物的论文，关键词有“哲学家”“中庸之道”“逻辑学”等，该人物最有可能是

亚里士多德

[单选题]We can learn from the passage that the author __________.

does not want to lose handwriting

解析：【解析】推理判断题。由最后一段可推知。

[单选题]一品红为大戟属的一观赏植物。其最引人注目的是( )。

茎上部叶

[单选题]What did duret do shortly after the ambulance came? ( )

He disappeared from the spot quickly