Professional sports are very popular in the United States and they are big business. The most popular sports are basketball, football and baseball. ___1___ has its own season. And ___2___ supporters. Professional teams are named for the cities ___3___ they are located. When a team plays in a championship game, most people in the city ___4___ the game with interest and enthusiasm. Basketball is ___5___ around the world. Professional basketball games in the US ___6___ indoors during winter months. From November to April ___7___ can find a professional basketball game several nights a week in most large ___8___ cities. Basketball is an American sport. It ___9___ the national pastime.
The game is played in the evening ___10___ every night of the week and ___11___ weekends as well. The season begins in April and ___12___ in the October. Football ___13___ most popular professional sport in the US. It is played on Sundays ___14___ the fall from August to January. American football is different ___15___ international football, ___16___ Americans called soccer. Both games require ___17___ and specialized skills. Professional players are very ___18___.The most famous players ___19___ millions of dollars for their playing skill. American best players have higher ___20___ than the country’s president.
1. A. Every B. Both C. Each D. All
2. A. million B. millions C. million of D. millions of
3. A. when B. where C. who D. whose
4. A. follow B. walk C. run D. jump
5. A. well-known B. well C. known D. fame
6. A. played B. is played C. plays D. are played
7. A. somebody B. one C. anyone D. everybody
8. A. America B. England C. American D. English
9. A. was called B. has been called C. is called D. be called
10. A. nearly B. close C. closely D. near
11. A. at B. in C. on D. during
12. A. finish B. finishing C. finished D. finishes
13. A. became B. is become C. is becoming D. has become
14. A. during B. while C. on D. at
15. A. of B. from C. with D. about
16. A. when B. that C. where D. which
17. A. strong B. strength C. strengthen D. stronger
18. A. well pay B. good pay C. well paid D. good paid
19. A. make B. had C. got D. received
20. A. money B. salaries C. pay D. wage
，磁铁与铁板间的引力为磁铁重力的0.2倍，磁铁与铁板间的动摩擦因数
，现给磁铁一个水平向左的初速度
，不计磁铁经过B处转向的机械能损失（
g取
），求：
