【題目】________ is a gas that is necessary for people and animals to live.
A.Oxygen
B.CO2
C.Smell

【答案】A
【解析】句意:……是一種對人和動物生存很必要的氣體。結(jié)合實際可知我們必需的氣體是氧氣(Oxygen),故選A。

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