一、单项选择 (本题共10小题；每小题1分，满分10分)
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. From _________ space, you can see 71% of the earth is covered with water. It looks like _________ blue ball.
A. /; a B. the; a C. a; a D. /; the
2. It is impolite for children to _________ when their parents are talking with others.
A. cut down B. cut out C. cut in D. cut short
3. ─ The Internet service fees are too high, and the speed is too slow.
─ That’s why Premier Li Keqiang asks operetors (运营商) to keep Internet _________.
A. many cheaper and quicker B. very cheaper and quicker
C. more cheaper and quicker D. much cheaper and quicker
