示波器“辉度”旋钮，用于控制荧光屏上波形显示的（）

A.清晰度

B.幅度

C.亮度

D.色度

A. give a friend a ride
B. adopt a new hobby
C. feel less out of control
D. learn a new set of skills
E. need each other to survive
F. take some time to exercise
G. weigh down hard on one’s family life

When times are tough people should still remember to ______.