In drilling through the ice in Antarctica, scientists have found that _________．


  1. A.
    the lowest temperature there is -40℃
  2. B.
    the depth of ice is 3, 000 meters
  3. C.
    the ice has existed for 15, 000 years
  4. D.
    snowfalls are kept in certain patterns

We can infer from Eric Wolff’s words that _________．


  1. A.
    there is something wrong with the data
  2. B.
    greenhouse effect is always a bad thing
  3. C.
    a new ice age will not come in the near future
  4. D.
    greenhouse gas will get thick in the future

The information of the global climate conditions in the past can be obtained(获得)through _________．


  1. A.
    separating carbon dioxide from the air
  2. B.
    examining the growth ringsof trees
  3. C.
    comparing temperatures in different areas
  4. D.
    studying the ice and air caught in each layer

True friends always stick with each other through ________．


  1. A.
    black and white
  2. B.
    good and bad
  3. C.
    thick and thin
  4. D.
    young and old

If you mix ________ those papers, we won't be able to find the one we need quickly enough.


  1. A.
    in
  2. B.
    up
  3. C.
    into
  4. D.
    with

Electricity was ________ because of the earthquake.


  1. A.
    cut down
  2. B.
    cut out
  3. C.
    cut off
  4. D.
    cut up

I don't know whether it is a chemical ________.


  1. A.
    substance
  2. B.
    object
  3. C.
    matter
  4. D.
    thing

She decided to ________ the stage when she was very young.


  1. A.
    go to
  2. B.
    go on
  3. C.
    go up
  4. D.
    go over

E-mail is short for ________ mail.


  1. A.
    electric
  2. B.
    electrical
  3. C.
    electronic
  4. D.
    electricity

_____, the boy really knows a lot.


  1. A.
    As young as he is
  2. B.
    Young as he is
  3. C.
    As child he is
  4. D.
    A child as he is
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