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【单选题】
泡沫灭火器通过( )与空气混合后，产生大量的泡沫，使燃烧物表面冷却，降低燃烧物表面温度，起到灭火作用。A.
泡沫液
B.
二氧化碳
C.
四氯化碳
D.
氮气
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举一反三
【单选题】Which of the following is not a form of precipitation? _____ .
A.
Rain.
B.
Frost.
C.
Sleet.
D.
Snow.
【简答题】Identify the purpose of the following texts (Task A、 B、 C) on page 146-147.
【单选题】Which of the following characteristics is one of the most important variables in successful language learning?
A.
Maximum foreign talk.
B.
Even participation.
C.
High motivation.
D.
Right language level.
【单选题】147 Which of the following is referred to as sunk cost:
A.
management reserve
B.
contingency fund
C.
cost budgeted for construction under water
D.
expended funds over which there is no further control
E.
forecasted budget over-runs
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