Ｉ． 从Ａ、Ｂ、Ｃ、Ｄ四个选项中选择最佳答案。（每小题1分，共15分）
( ) 21. A report says that kids in the USA are the unhappiest, though it is _____ the richest countries in the world.
A. among B. between C. with D. in
( ) 22. France is ___________ its wine.
A. famous as B. famous for C. known as D. afraid of
( ) 23. Although the rain was heavy, ______ all the students got to school on time.
A. but C. however C. even D. /
( ) 24. — What did the teacher say?
— He said that the Nile ___ the longest river in the world.
A. was B. were C. is D. are
