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【简答题】
设a＞0，b＞0，若矩阵A= a 0 0 b 把圆C：x 2 +y 2 =1变换为椭圆E： x 2 4 + y 2 3 =1． （1）求a，b的值； （2）求矩阵A的逆矩阵A -1 ．
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【单选题】Jack wasn't saying anything,but the teacher smiled at him ___ he had done somethingvery clever. [ ]
A.
as if
B.
in case
C.
while
D.
though
【单选题】Jack wasn't saying anything，but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
A.
as if
B.
in case
C.
while
D.
thought
【单选题】Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
A.
as if
B.
in case
C.
while
D.
though
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