单项选择题
A.19 B.18 C.17.6 D.17.4
A.1.5 B.1.6 C.1.7 D.1.8
A.3 B.5 C.6
A.2.5—2.8 B.2.7--3.1 C.2.8--3.2 D.2.9--3.3
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