如图所示中静止的小球m分别与两个物体（或面）接触，设各接触面光滑，则A受到两个弹力的是[ ]
A.
B.
C.
D.
BC
The government has been under growing pressure to ________ the causes of air pollution as smog frequently smothers the country’s large cities.
A．release
B．schedule
C．address
D．maintain
—Is he heavy?
—No, he's a little ____. [ ]
A. tall
B. thin
C. short
D. quiet
