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【单选题】
如图所示，正方形ABCD的面积为18，△ABE是等边三角形，点E在正方形ABCD内，在对角线AC上有一点P，使PD+PE的和最小，则这个最小值为（ ）A.
3 2
B.
9 2
C.
6
D.
3
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【简答题】研究样品表面形貌特征的的主要研究方法:————;————;————
【单选题】We met Mary and her husband at a party two months ago. ______ we've had no further communication.
A.
Thereof
B.
Thereby
C.
Thereafter
D.
Thereabouts
【简答题】阅读理解。 Mrs Green is going to give her daughter, Mary, a birthday party. Mary will be ten years old. A lot of her friends are coming to the party. Twenty of them are girls. Mrs Green is getting ready fo...
【单选题】Mary is the love of my life. I still remember that I met her ____ the airport ____ a snowy evening.
A.
in; at
B.
at; on
C.
on; by
D.
to; before
【简答题】阅读理解。 Mrs Green is going to give her daughter, Mary, a birthday party. Mary will be ten years old. A lot of her friends are coming to the party. Twenty of them aire girls. Mrs Green is getting ready f...
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