The coldis the most common of man’s ailments(疾病). Yet it stumped(难住)the medical authorities. Many of more terrible diseases have comeunder the control of modem man as the result of the knowledge gained in the labof science research. Investigators have thought that the cold is usually causedby a virus(病毒). However, no method of studying this virus has been devised(提出). The chimpanzee(黑猩猩)is the only animal towhich the disease can be given experimentally. The use of this animal islimited by its cost and by the fact that so many of the animals die ofpneumonia during the experiments. This leaves for all practical purposes onlyhuman volunteers to be used in research projects. Many people of prisons havehelped in this work, but because of .these limitations, research into the causeand cure of colds has progressed very slowly.Research into the cause and cure of colds has________.


  1. A.
    gone ahead very slowly
  2. B.
    gone ahead very quickly
  3. C.
    been very common
  4. D.
    been impossible

There are many old trees in our school, each ________ about 100 years ago．


  1. A.
    dates from
  2. B.
    dates back
  3. C.
    dating from
  4. D.
    dating back

It's not what we do once in a while ______ shapes our lives, but what we do consistently
　　


  1. A.
    which
  2. B.
    that
  3. C.
    how
  4. D.
    when

It is most instructive lecture that I _______ since I came to this school.


  1. A.
    attended
  2. B.
    had attended
  3. C.
    am attending
  4. D.
    have attended

Oh, it’s you．I ________ know you ________ here．


  1. A.
    don’t;are
  2. B.
    didn’t;are
  3. C.
    didn’t;were
  4. D.
    don’t;will be

He is considering ________ abroad for further study．


  1. A.
    going
  2. B.
    of going
  3. C.
    to go
  4. D.
    go

You will be accepted for the course ________ it isn’t full, in which case we will inform you．


  1. A.
    when
  2. B.
    unless
  3. C.
    while
  4. D.
    but

There is no ________ what he is going to do.


  1. A.
    tell
  2. B.
    telling
  3. C.
    told
  4. D.
    to tell

When he realized the police had spotted him，the man      the exit as quickly as possible．


  1. A.
    made　off
  2. B.
    made　for
  3. C.
    made　out
  4. D.
    made　up

________ go abroad to have a further education, he works hard at English day and night．


  1. A.
    Itch to
  2. B.
    Itching to
  3. C.
    Having an itch for
  4. D.
    Itch
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