题目

阅读理解Hear the Wind Blow by Mary Downing Hahn On a cold, snowy night, 13-year-old Haswell Magruder makes an important decision. A wounded Confederate soldier appears at the family's farm, and Haswell convinces his mother to take the man in. Unfortunately, this sets off a horrific chain of events that leaves their house burned to the ground and their farm in ruins. With no home left, Haswell sets out in search of his older brother, a Confederate soldier. Ghosts of Greenglass House by Kate Milford Thirteen-year-old Milo is, once again, spending the winter holidays stuck in a house full of 18.下列说法正确的是(  )A.单位体积内的气体分子数增加,气体的压强一定增大B.气体对器壁的压强就是大量气体分子单位时间作用在器壁上的平均动能C.气体分子热运动的平均动能减少,气体的压强一定减小D.气体对器壁的压强就是大量气体分子作用在器壁单位面积上的平均作用力
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