题目内容

植物体的表皮细胞的功能只起保护作用。( )

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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

Student：1 was wondering if I could take four courses next semester． Advisor：__________？We

A. Come on．Four is better than three
B. Why don’t you choose three instead of four
C. Dare you try to take four
Don’t you believe four courses are OK

Waiter：Good evening，madam．Would you like to sit here？Customer：__________．Have you got a menu，please？

A. Very good
B. Fine
C. You’re welcome
D. I"d like to

成熟的筛管是无细胞核的特殊的生活细胞。( )