A．describe
B．describing
C．to describe
D．description of

Americans still say,'Go west,young man',because______.A．if they go west they can have a travelB．in the west there is a prisonC．there they have to live a hard life to grow into menD．the prison doesn't change them

A.
A．if
B.in
C.there
D.the

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苔藓植物与轮藻的生活史中都有( )。

A.原叶体时期
B．原丝体时期
C．茎叶体时期
D．叶状体时期

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