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【单选题】
下列说法中正确的个数有（ ） ①对角线互相平分且相等的四边形是菱形； ②有一组对边平行的四边形是梯形； ③如果四边形的两条对角线互相垂直，那么它的面积等于两条对角线长的积的一半； ④如果一个四边形绕对角线的交点旋转90°后，所得图形与原来的图形重合，那么这个四边形是正方形．A.
1个
B.
2个
C.
3个
D.
4个
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皮皮学刷刷变学霸
举一反三
【单选题】Only when he has lost his way ______ that he wasn' t careful enough to make sure that he really did understand.
A.
he realize
B.
he can realize
C.
he has realized
D.
does he realize
【简答题】主轴的拆装应从两端的 开始,然后从箱体 向 拆卸。
【单选题】He left home early only______he was late as he went a wrong way.
A.
found
B.
to find
C.
finding
D.
being found
【单选题】--- Does Mike play basketball every day? --- He ________ that way, but now he plays only on Sunday.
A.
used to play
B.
is used to play
C.
used to playing
D.
was used to play
【单选题】The only way he could do it-and by 'it' he means achieving the level of fame enjoyed by Martin, who is so famous that his infant daughter, Apple, is better known than the rest of Coldplay combined—is ...
A.
preposterous
B.
preludial
C.
precise
D.
preponderant
【单选题】I was impressed by the way he could formulate his ideas, for he was only two years old.
A.
devise
B.
handle
C.
express
D.
demonstrate
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