完形填空。 What do you know about the sea (大海)? Some people often see it, __ 1 __ the others don't. The sea looks __ 2 __ on a fine sunny day. Millions of people hope to take their __ 3 __ by the sea. They can swim in it, or lie on the beaches in the sun. They __ 4 __ themselves there. But it can be very rough (猛烈) when there is a strong wind. What other things do we know about it? Of course, the sea is very large. Looking at a __ 5 __ of the world, you can see it is much bigger than land. There are a lot of __ 6 __ in the sea. Some of them are big and the others are __ 7 __. Did you swim in the sea? If you answer 'Yes', you may know that the water is salty (咸的). Rivers carry __ 8 __ from the land to the sea. Some places of the sea are more salty than other places. Do you know the Dead Sea (死海)? Fish __ 9 __ live in it. And people can easily swim in it. Nobody is afraid to __ 10 __ in the water. (    )1. A. and (    )2. A. useful (    )3. A. classes (    )4. A. enjoy (    )5. A. book (    )6. A. roads (    )7. A. small (    )8. A. sugar (    )9. A. can (    )10. A. lift B. so B. beautiful B. sports B. like B. map B. shops B. young B. butter B. must B. sink C. but C. terrible C. meetings C. stop C. newspaper C. houses C. little C. salt C. can't C. walk D. or D. weak D. holidays D. begin D. picture D. islands D. good D. oil D. mustn't D. sleep