问题 选择题

已知某两种物质在一定重要条件下发生化学反应,其微观示意图如图下所示。下列说法正确的是

A.该反应的反应物和生成物中共有四种分子

B.该反应的反应物都是单质

C.反应物中两种物质的分子恰好完全反应

D.该反应中生成物有单质和化合物

答案

答案:A

题目分析:由图知该反应的反应物和生成物中共有四种分子;单质是指只含有一种元素的纯净物,所以由图反应物既有化合物又有单质,根据图可知,反应后并不是反应物恰好完全反应,还有两个分子剩余,剩余的并没有参加反应,不属于生成物,所以生成物里只有化合物,没有单质。

点评:此题利用微观图来考察化学反应的意义,且属于不是恰好完全反应的类型,注意判断剩余物质的分类。

完形填空

第二节   完形填空(共20小题,每小题1分,满分20分)

I am a mother of three,and have recently completed my college degree.The last class I had to  36 was Sociology.The teacher’s last  37 of the term was called“Smile.”The class was asked to  38 and smile at three people.My husband,youngest son and I headed for McDonald’s.It was just our  39 of sharing special playtime with our son.We were standing in line,waiting to be 40  when all of a sudden everyone around us began to back away and then 41  my husband did.

I sensed a 42 smell and turned around.and there 43  behind me were two poor homeless men.As I 4 4 down at the short gentleman 4 5  to me,he was“smiling”.The second man rubbed his hands stupidly as he stood   46  his friend.   。

I was so touched by the   47 that I held my tears as I stood there with them.The young lady at the 48 asked him what they wanted.He said,“Coffee is all,Miss;”because that was all they could  49 .Then I smiled and asked the young lady behind the counter to give me two more breakfast meals on a  50  tray.Then I walked to the table that the men had chosen as a resting spot.I put the tray on the table and   51  my hand on the blue-eyed gentleman’s cold hand.He looked up at me,with   52  in his eyes,and said,“Thank you.”I started to cry as I walked away to  53 my husband and son.

I returned to my  54 on the last evening of class,with this story in hand.I turned in“my project”.I   55 with one of the biggest lessons I would ever learn.

36.A.teach           B.attend                 C.pass                D.turn

3 7.A.goal           B.paper                C.project            D.degree

38.A.get together   B.go out                C.stay inside       D.keep calm

39.A.field            B.way                    C.chance            D.interest

40.A.served         B.charged               C.expected         D.ordered

41.A.only            B.even                   C.just                 D.still

42.A.good           B.stressful              C.horrible          D.pleasant

43.A.standing      B.falling                C.1ying              D.sitting

44.A.threw          B.headed                C.looked            D.seated

45.A.generous      B.close              C.friendly          D.similar

46.A.before         B.behind                C.after                  D.over

47.A.smell           B.condition        C.health         D.smiles

48.A.counter        B.chair                  C.door                  D.table

49.A.eat              B.afford                 C.find                D.cook

50.A.separate       B.beautiful             C.large               D.expensive

51.A.laid             B.set                      C.caught            D.stuck

52.A.smiles         B.surprises             C.pities              D.tears

53.A.search         B.join                    C.invite              D.get

54.A.home                 B.job                     C.college            D.work

55.A.dealt           B.did                     C.graduated        D.dropped

单项选择题