问题 选择题

我市盛产茶叶,“雪青”、“清润茗芽”等绿茶享誉省内外。绿茶中的单宁酸具有抑制血压上升、清热解毒、抗癌等功效,其化学式为C76H52O46,下列说法正确的是

A.一个单宁酸分子中含26个氢分子

B.单宁酸中含有76个碳原子、52个氢原子和46个氧原子

C.单宁酸中碳、氢、氧元素的质量比为76:52:46

D.单宁酸由碳、氢、氧三种元素组成

答案

答案:D

题目分析:A.一个单宁酸分子中只含有52个氢原子而不存在氢分子;B.单宁酸中含有碳氢氧三种元素,只能说它的一个分子中含有76个碳原子、52个氢原子和46个氧原子 ;C.单宁酸中碳、氢、氧元素的质量比应该是12X76:52:16X46,计算化合物中元素的质量比时应该用相对原子质量乘以原子个数后再相比,所以只有D是正确的

选择题
完形填空

二、完形填空

When an NBA player is young he thinks he can win the championship by himself. It is only later when he has aged and been through many battles  36  he learns an important lesson: there is no “I” in “team”.

There is  37  better example of the value of teamwork than the Boston Celtics. Paul Pierce, Ray Allen and Kevin Garnett were all  38  on three different teams. Yet, none of them had any titles to show for it.  39  last season, they  40  to sacrifice money and individual statistics to play together. Garnett and Allen joined Pierce on the Celtics and  41  the NBA in the process.

It started in simple ways. Garnett and Allen are two of the most intense athletes in the world. They treat every second of every practice like it is the NBA  42 . If you want to play alongside them then you will have to do the same. So, the young guys on the Celtics started giving their full effort too.

Pierce had been the star of the Celtics for many years. He  43  shoot the ball many times a game. But with the addition of Allen and Garnett he shot less and  44  on defense. His  45  showed the young players that doing what made the team better was the only thing that  46 .

When the Celtics  47  and the game was almost over, Garnett, Pierce and Allen would come out of the game. But they wouldn’t just sit on the bench.  48 , they stood and cheered and  49  for their teammates. They wanted to support their friends and  50 .

Now, the guys who don’t play know they can still  51  the game by cheering so they scream and cheer when Garnet, Allen and Pierce are playing. The Celtics have developed a strong  52 . They are more than just teammates. They are  53 .

The result: the Boston Celtics won the 2008 NBA championship and are considered the favorites to  54  the Eastern Conference championship again this year.

There is a saying that  55 , “A successful team beats with one heart.” If that is the case, the Celtics may have the biggest heart in the NBA.

36. A. that              B. when                    C. where                D. which

37. A. not                    B. no                           C. never                 D. seldom

38. A. super stars          B. film stars           C. football stars          D. known persons

39.   A. Yet                  B. Though             C. Then                 D. Finally

40.   A. meant              B. planned             C. decided           D. intended

41.   A. created             B. changed                C. maintained         D. altered

42.   A. championship    B. test                   C. practice          D. drill

43.   A. would              B. used to                    C. could                 D. need

44.   A. focused            B. looked                     C. depended               D. relied

45.   A. selfishness        B. selflessness         C. heroism                  D. male chauvinist

46.   A. happened      B. took                    C. came                D. mattered

47.   A. were winning    B. were failing        C. were going              D. were rising

48.   A. However         B. But                     C. Though            D. Instead

49.   A. shouted        B. laughed               C. screamed          D. neighed

50.   A. teammates           B. relatives                   C. families            D. audience

51.   A. effort                      B. afford                     C. effect                      D. affect

52.   A. teamship       B. connection               C. friendship          D.relationship

53.   A. friends             B. brothers            C. comrades          D. teammates

54.   A. beat                 B. defeat                      C. knock                  D. hit

55.   A. writes              B. goes                    C. speaks                 D. talks