----The government claims to exercise control over housing prices. But the fact is_______ ideal.

---- It’s _______ wonder that there are constant complaints on the Internet.

A．free from; not a

B．free of; not a

C．far from; no

D．far away; no

如图，光滑固定的金属导轨M、N水平放置，两根导体棒P、Q平行放置在导轨上，形成一个闭合回路。当一条形磁铁从高处下落接近回路时

A．P、Q将相互靠拢

B．P、Q将互相远离

C．磁铁的加速度仍为g

D．磁铁的加速度小于g