以下提法不妥的是（）。
A.怒则气上
B.喜则气消
C.恐则气下
D.惊则气乱
E.思则气结
参考答案：B
Great changes have taken place in that school. It is no longer_____ it was 20 years ago,__________ it was so poorly equipped.
A. what; when B that; which C. what; which D. which ;that
气体流经渐缩喷管而射向真空，则流速和流量的变化分别为( )。
A．减小，不变 B．增大，减小 C．增大，不变 D．减小，增大
