如图所示为一皮带传动装置，在匀速传动过程中皮带不打滑，r_B＝2r_C＝2r_A.，则轮上A、B、C三点的线速度、角速度的关系正确的是

A．三点的线速度之比v_A: v_B: v_C=1:1:2 

B．三点的线速度之比v_A: v_B: v_C=2:2:1

C．三点的角速度之比 ω_A: ω_B: ω_C=1:2:2            

D．三点的角速度之比ω_A: ω_B: ω_C =2:1:1

It is said ______ vegetables and fruits are good to our health, apples and pears _________.

A．that, including

B．what, including

C．that, included

D．what, included