泄水重力坝的下游消能方式主要有（）、（）、（）和（）消能。
参考答案：挑流；底流；面流；消力戽
良性子宫平滑肌瘤也可以发生转移，其最常见的转移部位是（）
A.肺
B.后腹膜
C.纵隔淋巴结
D.软组织
E.骨
用词的适当形式填空。
1. Thank you for______ (help) me.
2. Thanks for your ______(invite).
3. Zhang Ming ______(have) to stay at at home to look after his brother because his mother isn't at home.
