问题 选择题

下列关于气体的说法中正确的是

A.气体温度升高时,分子的平均动能增大,撞击器壁的平均作用力增大,气体压强一定增大

B.气体体积变小时,单位体积的分子数增多,单位时间内撞击到器壁单位面积上的分子数增多,气体压强一定增大

C.气体吸收热量,同时对外界做功,,气体分子平均动能一定增加

D.分子a从远外接近分子b的过程中,忽略其它分子对a的作用,a受b的作用力为零时,a的动能一定最大

答案

答案:D

影响压强的微观原因是:单位时间内单位面积上受到的撞击次数和一次撞击的力,所以只是温度升高,撞击的力增大,不能确定撞击的次数,所以A错;

气体体积变小时,分子密度是增大,但是分子撞击的力不能确定,所以压强不一定增加,B错;

,吸收热量Q>0,对外做功W<0,不能确定内能是否增加,所以温度不一定升高,C错;

从远处靠近时分子间体现引力,到分子力为零之前一直是引力做正功,动能增加,分子势能减少,D对。

选择题
完形填空

第二节:完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,然后从36-55各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

There was a rich foreign merchant who had 4 wives. He loved the 4th wife most and  36  her with best clothes and  37  her to delicious food.

He also loved the 3rd wife very much. He’s very proud of her and always wanted to  38  his 3rd wife to his friends.

He too, loved his 2nd wife. 39  the merchant faced some 40  , he always turned to his 2nd wife and she would always help him out.

Now, the merchant’s first wife had made great  41  to his business. However, the merchant did not love her and although she loved him deeply, he hardly took notice of her.

One day, the merchant fell ill. He knew that he was going to die  42  . He told himself, “ Now I have 4 wives with me. 43  when I die, I’ll be alone. How  44  I’ll be!”

Thus, he asked the 4th wife, “ I  45 you most. Now that I’m dying will you 46  me and keep me company?” “No way!” replied the 4th wife and she walked away without another word.

The  47  merchant then asked the 3rd wife, “ I have loved you so much for all my life. Will you follow me and keep me company?” “ 48  !” replied the 3rd wife. “ Life is so good over here! I’m going to 49  when you die!”

He then asked the 2nd  wife, “ I 50 turned to you for help. Now I need your help again. Will you follow me and keep me company?” “I’m sorry, I can’t  51  you out this time!” replied the 2nd wife.

Then a 52 pulled out, “ I’ll leave with you. I’ll follow you no matter  53  you go.” Broken-hearted, the merchant said, “ I should have taken much better  54  of you while I could have.”

Actually, we all have 4 wives in our life: our body, our possessions, our friends, and our 55  . We should take good care of our soul all our life.

36 A wore                    B bought          C dressed              D shared

37 A gave                 B treated          C provided                D sent

38 A show off         B turn off        C show out            D turn out

39 A Wherever          B However        C Whether             D Whenever

40 A requests         B exercises        C problems             D duties

41 A friends           B contributions   C differences         D attempts

42 A soon              B fast            C easily               D bitterly

43 A So                   B And                  C But                          D For

44 A lonely              B friendly             C lovely                         D lively

45 A respected              B missed               C wanted                     D loved

46 A like                      B catch             C take                         D follow

47 A sad                         B hopeless            C anxious                    D lucky

48 A Yes                  B No                    C Sure                         D OK

49 A work                B leave             C remarry                    D stay

50 A seldom          B always               C sometimes            D never

51 A advise         B demand             C suggest                     D help

52 A voice            B sound            C shout                    D laugh

53 A how                 B where            C when                    D why

54 A advantage       B pity                    C care                         D control

55 A wealth           B health            C power                         D soul