仪表指针开始动作的信号（），仪表的灵敏度就越高。
A.越小
B.不变
C.越大
D.略大
参考答案：B
—I am going to wear jeans to the party.
—If you do, the teachers ______ let you in. [ ]
A. don't
B. didn't
C. haven't
D. won't
brightness的含义是颜色三属性中的（）。
A、色相
B、明度
C、饱和度
D、彩度
