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【单选题】
已知int i=5,下列do-while循环语句的循环次数是 do{ cout<A.
0
B.
1
C.
5
D.
无限
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【简答题】设矩阵 (其中a＞0，b＞0)， (Ⅰ)若a=2，b=3，求矩阵M的逆矩阵M -1 ； (Ⅱ)若曲线C：x 2 +y 2 =1在矩阵M所对应的线性变换作用下得到曲线C′： ，求a，b的值．
【单选题】She was very happy. She ran of all the runners.
A.
fastest
B.
the quickest
C.
slowest
D.
quickly
【单选题】________ she ran to the classroom, the teacher had begun the class.
A.
What time
B.
By the time
C.
At the time
D.
During the time
【单选题】She ran to the hospital________ she heard the bad now.
A.
at the moment
B.
the moment
C.
in a moment
D.
do the moment
【单选题】She ran across the street because she ______ her brother on the other side.
A.
met
B.
knew
C.
saw
【简答题】选修4-2：矩阵与变换 设矩阵 M= 1 a b 1 ． （I）若a=2，b=3，求矩阵M的逆矩阵M -1 ； （Ⅱ）若曲线C：x 2 +4xy+2y 2 =1在矩阵M的作用下变换成曲线C'：x 2 -2y 2 =1，求a+b的值．
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