单项选择题
A.8~10 B.9~10 C.7~9 D.6~8
A.2.7℃/100m B.2.8℃/100m C.2.9℃/100m D.3℃/100m
A.25℃和30℃ B.26℃和30℃ C.26℃和29℃ D.25℃和29℃
A.5.0 B.6.0 C.7.0 D.8.0
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