颌面骨中惟一可活动的骨骼是()
A．上颌骨
B．下颌骨
C．颧骨
D．鼻骨
E．额骨
参考答案：B
—Does Peter have a tennis racket?
—_______. But he has some tennis balls.[ ]
A. Yes, he does
B. Yes, he is
C. No, he isn't
D. No, he doesn't
