题干

农民伯伯经常在雨后一两天对庄稼进行松土,其意义在于(    )

A:使土壤充满空气,促进根部呼吸

B:排除田间杂草,促进植物生长

C:使土壤中充满二氧化碳,抑制根的呼吸

D:锄断庄稼过多的根,减少有机物的消耗

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答案(点此获取答案解析)

A

同类题2

阅读下列短文,从文后各题所给的四个选项中选出一个最佳答案。

Each of us makes mistakes from time to time. In fact, we can   1   a lot from our mistakes.

    Donnie was a  2  student and never answered questions in class. He was  3 to make mistakes. He never finished his homework  4   he didn’t want to make any mistakes. Nothing changed  5  Marry Anne, a teacher, came to our 6  . One morning, Marry Anne asked Donnie to  7 some questions. After a while Donnie was in tears because he made a mistake.    8    Marry Anne got a box full of erasers from the desk.

    “Look, Donnie,” she said standing    9  him. “I’ve got something to show you.” She  10    the erasers, one at a time, and put them on the desk. “See these erasers, Donnie?” she continued. “Do you know   11 the erasers become smaller and smaller? That’s because we make mistakes. But we erase(删除)the mistakes and try   12  . That’s what you must learn.”

    “Here,” she said, “I’ll   13  one eraser on your desk, so you will remember that  14  may make mistakes.” Donnie looked at Marry Anne and smiled.

    Donnie 15   a lot from then on. He knew that everyone had the permission(允许) to make mistakes as long as you learned them and tried again.

36A. take         B. make          C. get             D. bring

37A. good         B. shy          C. clever           D. small

38A. glad         B. excited        C. surprised         D. afraid

39A. because      B. so           C. if                D. but

40A. after         B. while         C. until              D. when

41A. row          B. class          C. team             D. classroom

42A. answer       B. ask          C. give             D. have

43A. Suddenly     B. Unluckily      C. Luckily           D. Carefully

44A. on           B. with         C. beside            D. to

45A. put out       B. took away    C. took out         D. took off

46A. when        B. how          C. what             D. why

47A. more        B. again         C. another           D. one

48A. forget        B. carry         C. leave             D. take

49A. nobody      B. somebody     C. no one             D. everybody

50A. c hanged     B. got           C. learned           D. Thought