题目内容

“This element of the unknown”in the third paragraph refers to the fact that__________ ．

A. earthquake—related destruction has been beyond calculation
B. millions of people have died during earthquakes
C. earthquakes may occur anywhere at any time
D. there are other phenomena resulting from earthquakes

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当花药发育成熟时，花药壁由表皮层和药室内壁构成，中层和绒毡层都消失了。( )

豆科植物分为三个亚科，但它们具有一些共同特征，即都具有蝶形花冠、荚果。( )

I haven’t a thing__________ with my father．

A. in common
B. in large
C. in short
D. in general

比较单、双子叶植物根初生结构的异同点。