When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________.
A．protect the thing on fire
B．a(chǎn)dd weigh to the thing on fire
C．keep the air away from the thing on fire
D．lower the temperature of the thing on fire
C

試題分析：句意：當(dāng)某物起火的時(shí)候，人們?nèi)由匙釉诨鹕厦�。主要目的是用沙子去阻止空氣與火的接觸�？疾楣潭ǘ陶Z(yǔ)：keep sth. away from sth.保持某物遠(yuǎn)離某物。故選C
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