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具有形成层的维管束称为有限维管束，无形成层的维管束称为无限维管束。( )

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Though he spent much time on the last maths problem，yet he still couldn’t__________it．

A. solve
B. count
C. reflect
D. determine

With apples at 25 cent8 a pound，We eouldn’t resist__________four pound．

A. to take
B. took
C. taking
D. being taken

植物体的表皮细胞的功能只起保护作用。( )

Homework in American schools is often minimal__________ the children have plenty of time to watch television．

A. such that
B. so that
C. that
D. because