当坝岸前流速较大、坍塌后水下已裸露土坝体时，可采用（）抢护方法。
A.抛填散土
B.挂柳
C.挂木排
D.柳石枕
参考答案：D
大脑皮质各层内神经元相互作用的方式有（）
A.局部回路
B.同步
C.汇聚
D.扩散
E.反馈
The concert _______ many foreign students were invited was a feast for the eyes.
A．for which
B．to which
C．in which
D．on which
