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【多选题】
下列对观察旅游者的体貌特征描述正确的有A.
北欧各国的平均身高要比南欧和东欧国家矮；
B.
欧洲游客大都是白皮肤、鼻梁较高；
C.
性格内向、保守的人，一般比较喜欢自然的发型；
D.
女性留短发，则显现出有活力、性格坚强的特点
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【单选题】--- I hope Jim won’t mind lending you his new digital camera. --- He ___________. I have already borrowed one from my cousin, David.
A.
shouldn’t
B.
mustn’t
C.
needn’t
D.
can’t
【简答题】质数只有( )个因数。合数至少有( )个因数,1有( )个因数。
【简答题】质数只有( )个因数,合数至少有( )个因数,( )既不是质数也不是合数。
【单选题】I am a very lucky girl and my family is the nicest in the world. Mummy and Daddy are important of course and when we're out we have to behave properly but when we're at home we play and laugh and have...
A.
the children of the family are disciplined
B.
their parents are the nicest in the world
C.
Mummy is good at telling jokes
D.
Daddy is cautious and happy
【单选题】— Will you read me a story, Mummy? — OK. You _____ have one if you go to bed as soon as possible. [ ]
A.
might
B.
must
C.
could
D.
shall
【简答题】质数只有（ ）个因数，合数至少有（ ）个因数． A.1 B.2 C.3．
【简答题】已知一棵二叉树如下图所示,写出对该树先序遍历、中序遍历和后序遍历的结果。
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