单项选择题

（）layer just above the internet layer.

A、Network Interface
B、TCP
C、Host-to-Host Transport
D、Application

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多项选择题

The students（）a group to protect the environment.

A.founded
B.established
C.set up
D.find
E.set

单项选择题

-（）do you like the new play？-It’s good and interesting.

A.How
B.Which
C.What
D.Whom

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