7、在等差数列中,已知
A、3 B、4 C、6 D、12
6、已知圆的方程为,则圆心和半径分别为
A、 B、 C、 D、
5、下列各式中最小值为2的是
4、设向量若向量与向量共线,则λ=
A、2 B、 C、1 D、
3、已知过点的直线与直线平行,则m的值为
A、0 B、 C、2 D、10
2、函数的最小正周期为
1、已知集合
A、φ B、 C、 D、
5. Commonly in your test, _______ anxious you are, ______ the result will be.
A. the more; the better B. the less; the less
C. the less; the better D. the more; the better
4. ________ he fail to come over, what could we do without him, for you see, we don’t have the key to the lab!
A. If B. Should C. In case D. Unless
3. Some of the classical stories can be ______ for use with the young children, for they like listening to stories.
A. adjusted B. arranged C. adapted D. adopted