闸阀的阀盘与阀座的密封面泄漏，一般是采用（）方法进行修理。A、更换； B、加垫片；

既能活血化瘀，又能化痰止咳的是 ( )

A．虎杖
B．丹参
C．桃仁
D．鸡血藤
E．红花

经济因素是市场经济条件下影响城市功能分区的因素。读“某城市地租分布等值线图”，回答问题。

小题1:图中等值线a、b、c的付租能力关系是(　　)

A．a>b>c

B．a<b<c

C．a＝b>c

D．a>b＝c小题2:造成图中局部地区地租分布等值线由中心向外凸出的主要因素是

A．地形条件

B．交通条件

C．人口分布状况

D．早期商业活动

There was a little boy   26  his grandparents on their farm.He was given a slingshot（弹弓）to play with,out in the woods.He   27  in the woods,but he could never hit the target.Getting a little  28 ,he headed back to dinner.Then,he saw Grandma’s pet duck,so he let fly,hit the duck square in the head,and   29  it.He was shocked and upset.In   30 ,he hid the dead duck in the woodpile,  31  to see his sister watching.Sally had seen it all,  32  she said nothing.

  33 lunch that day grandma said,“Sally,let’s wash the dishes.”

But Sally said,“Grandma,Johnny told me he wanted to   34  in the kitchen today,didn’t you Johnny?”And then she   35  to him,“Remember,the duck?”So Johnny did the dishes.

Later Grandpa asked if   36  wanted to go fishing,and Grandma said,“I’m sorry but I need Sally to help make supper.”

But Sally   37  and said,“Well,that’s   38  because Johnny told me he wanted to help.”

  39 the duck,Johnny had to stay and Sally went fishing.

After several days of Johnny doing both his   40  and Sally’s,he finally couldn’t   41 

it any longer.He came to Grandma and told her that he killed the duck.She   42  down,gave him a hug（拥抱）,and said,“Sweetheart,I know.You see,I was standing at the window and I   43  the whole thing.But because I love you,I   44  you.But I was just   45  how long would you let Sally make a slave of you.”

26.A.helping                 B.visiting                            C.tending                            D.seeking

27.A.practised               B.played                       C.worked                            D.hunted

28.A.anxious                B.tired                         C.pleased                      D.discouraged

29.A.caught                  B.injured                      C.killed                        D.seized

30.A.surprise                B.disappointment          C.anger                        D.horror

31.A.only                     B.so as                         C.in order                     D.expecting

32.A.so                        B.and                           C.instead                      D.but

33.A.At                        B.After                        C.Before                      D.Cooking

34.A.work                    B.stay                          C.help                          D.get

35.A.called                  B.whispered                  C.nodded                      D.signed

36.A.the children          B.Sally                         C.Johnny                      D.Grandma

37.A.sighed                  B.agreed                       C.objected                    D.smiled

38.A.easy                            B.all right                     C.fine                          D.impossible

39.A.Searching             B.Hiding                      C.Remembering            D.Regretting

40.A.homework            B.housework                 C.farm work                 D.cooking

41.A.stand                    B.change                      C.like                           D.cover

42.A.sat                       B.went                         C.lay                            D.knelt

43.A.know                   B.heard                        C.saw                           D.understand

44.A.missed                  B.forgave                            C.congratulated             D.punished

45.A.wondering            B.saying                       C.imaging                    D.considering

一项研究表明，植物对二氧化硫的抗性与叶片上气孔密度和气孔大小等有关。所得数据如下表：

(1)该研究说明，植物对二氧化硫的抗性与气孔的密度呈________关系，和每个气孔的面积呈______关系。

(2)在二氧化硫污染严重的地区，最好选择表中的____________植物为行道树种。

(3)工业生产中产生的二氧化硫是酸雨形成的主要原因之一。有人设计实验研究酸雨对植物的毒害作用。实验过程如下图所示（除特别说明之外，其他条件均相同）

上述实验中，判断“酸雨”对植物生长产生影响的依据可以是__________。（请至少写出两点）

(4)设置乙实验的目的是______________。

(5)实验结果表明_______________。

通风空调平、剖面图常用1:10、1:50的比例绘制。( )