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【单选题】
我国现阶段存在的非公有制经济包括（） ①个体经济 ②私营经济 ③混合所有制经济 ④外资经济A.
①②③
B.
②③④
C.
①②④
D.
①②③④
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举一反三
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【单选题】According to CDC, birds carry every known subtype of influenza A and can transmit the flu directly to humans.
A.
Y
B.
N
C.
NG
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【单选题】Flu is a contagious respiratory illness caused by influenza viruses that infect .
A.
the nose
B.
the throat
C.
lungs
D.
all of the above
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