【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(duì)人和動(dòng)物生存很必要的氣體。結(jié)合實(shí)際可知我們必需的氣體是氧氣（Oxygen），故選A。

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