通商航海条约主要涉及船舶航行和港口使用。( )

W：How is your new roommate?M：Well，all I could say is that he’s a real couch potato．Last weekend he invited me over to his parent’s house to watch TV．I bet watching TV is his only hobby，but he surely doesn’t know much．Q：What can we learn about the man’s new roommate?（）

A．He likes potatoes very much.
B．He doesn't know much about TV.
C．He is fond of watching TV.
D．He is as fat as a potato.

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“王小刚为什么不上学了”属于（）

A．普遍调查
B．抽样调查
C．个案调查
D．常模调查

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