海口市卫生幼儿园:初二各题

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1、根据(x-y)(x+y)=x^2-y^2,用(x-y)(x+y)做外项,写成比例式为__________

2、化简:√[2x+13+√(128x-192)]-√[2x-2+√(8x-12)](请提供解题思路或者过程)

3、设√(23-√448)的整数部分为a,小数部分为b,求a^2-b^2的值。(同上)

4、Mary was born _____ the morning____July 12
A.on...in B. in...on C.on...of D.of...on

5、I prefer _______ to _______ .
A.read books....watch TV
B.reading books....watch TV
C.to read books....watch TV
D.reading books....watching TV
这些题都不要回答了
只要告诉我at the distance 和 in a distance 的区别

好像只有in the ditance和at a distance。其中in the distance意为远处,the same as "over there".A ship could be seen in the distance.而at a distance则强调距离,如短语keep sb. at a distance.