A.To let out clean gas.B.To take in harmful gas.C.To use various plants.D.To let the a
A.To let out clean gas.
B.To take in harmful gas.
C.To use various plants.
D.To let the air flow freely.
A.To let out clean gas.
B.To take in harmful gas.
C.To use various plants.
D.To let the air flow freely.
A、chlorine
B、carbon dioxide
C、hydrogen
D、oxygen
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
(12)
A.People are expected to come at six.
B.A formal party will be held.
C.It will be a party for relaxation.
D.There is no need to prepare special clothes.
A.Go to class.
B.Go on a picnic.
C.Attend a meeting.
D.Attend the rally.
A.Some people have a low self-image.
B.There is always someone around who knows better.
C.Salesman talk people into buying things they don't want.
D.People do not share the common knowledge.
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