问题 单项选择题

RC桥式振荡电路中()

A、不存在任何反馈

B、同时存在正反馈与负反馈

C、只有正反馈

D、只有负反馈

答案

参考答案:B

问答题
完形填空

第二节完型填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

I watched as she led him by the hand to the bathroom in the waiting hall of the airport. Although he looked a little confused, he seemed   31   as long as his hand was in hers.

Returning to their seats at the gate, she   32  his hair and buttoned his jacket. He looked nervous and asked, “Where are we going, Mom? What time is it? When will we get to   33   our plane?”

I wondered about the woman’s patience and love. I   34   her take him by the hand when they were finally   35   to board.

Upon finding my seat, I discovered that the three of us would be   36  . I managed to pass the two of them to my window seat and then told him how handsome he looked in his new coat. He   37  . She helped take off his jacket and   38   his seatbelt. He said that he had to go to the   39  again, and she told him that he could last until the end of the   40  .

As the plane started, he became frightened and   41   for her hand. She calmed him down and began talking to him about whom to visit. He was confused about the different   42   they would be seeing, but she patiently repeated who was who   43   he seemed to understand.

We introduced ourselves and   44   the usual things all mothers like to exchange with one another. I   45   she had four children and was on her way to visit one of them.

The hour passed   46  , and soon we were preparing to land. He became frightened again, and she   47   his arm gently. She smiled and hugged him. “I love you, Honey.”

They   48   the plane before I did, the mother never realizing how deeply she had   49  me. I prayed for this remarkable woman and for myself that I would have enough love and   50  to meet whatever challenges came my way, as this extraordinary mother clearly had.

31.A.nervous    B.secure       C.strong        D.confident

32.A.washed     B.dried     C.combed     D.cut

33.A.ride      B.leave     C.see         D.land

34.A.found       B.noticed     C.made       D.watched

35.A.allowed    B.expected   C.announced        D.believed

36.A.apart     B.together    C.upset       D.different

37.A.cried     B.shook       C.responded   D.smiled

38.A.search      B.loosen      C.fasten        D.set

39.A.cafe     B.shop     C.bathroom   D.airport

40.A.day      B.flight     C.life         D.patience

41.A.struggled  B.prayed      C.looked       D.reached

42.A.relatives   B.books       C.places        D.children

43.A.until     B.when     C.after       D.since

44.A.explained  B.had      C.shared       D.enjoyed

45.A.heard          B.proved      C.knew       D.learned

46.A.slowly      B.quickly     C.silently      D.senselessly

47.A.seized       B.held     C.struck        D.beat

48.A.walked around B.wandered about        C.left for  D.got off

49.A.calmed     B.excited     C.touched     D.confused

50.A.strength    B.quality      C.energy       D.advantage