在对话空白处根据所给的首字母填入适当的单词，完成对话。

A: Did you have a great (1)t             on your vacation?

B: Yes, I (2)d            . 

A: (3)W             did you do on vacation?

B: I (4)v             my grandparents in Emei Mountains.

A: (5)H             were your grandparents?

B: They were fine. Thank you.

A: So (6)d             you go to the mountains?

B: Of course, I did. And I saw (7)l             of animals and tall trees there.

A: Did you give food to the monkeys?

B: Yes, I did. It was really interesting.

A: What (8)e             did you do there?

B: I (9)t             some (10)p            . Look here, my photos.

A: Wow, They're great.

能防止河道被淤积的最好措施是进行（）。

A、草皮护底

B、增设削防设备

C、下游设拦沙坝

D、水土保持