简述欧洲债券迅速发展的原因。

In the tennis match, Tonny often _____ us.  [ ]

A. beats

B. wins

C. hits

15.         we decided to spend the night at the foot of the mountain.

A．With the moon appeared

B．The moon appeared

C．The moon being appeared

D．As the moon appeared

道班工人要维修一条长900米的公路，前5天修了225米，照这样的速度，还要多少天才能修完这条公路？

在宽度小于（）的内走道顶棚上安装探测器时，宜居中安装。

A.1.0m

B.1.5m

C.2.0m

D.3.0m

当路由器的数据链路层收到上层所发报文的长度大于该路由器发送该报文接口的最大MTU采取的策略是（）.

A.丢掉该报文时

B.将该报文分片

C.向源路由器发出请求，减小其报文大小

D.直接转发该报文