题目：
Li Keqiang, ______ head of the Chinese government, said in his report on March 5,2014 that the government would try every ______ to deepen the reform further.
A．the; means
B．a; mean
C．不填; means
D．the; mean
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
4CO2+ 2X+ 6H2O，则X的化学式为[ ]