问题描述：
1.The most famous are the Canadian Roswell,_______(know)in China as Dashan.
2.They sat there,________(read)their textbooks.3.---Is Tom in?---_____,please.I'll see if I can find him for you.A.Hold up B.Hold on C.Hold off D.Hold out
2.They sat there,________(read)their textbooks.3.---Is Tom in?---_____,please.I'll see if I can find him for you.A.Hold up B.Hold on C.Hold off D.Hold out
问题解答：
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