在一定温度和压强下的理想气体，影响其所占体积大小的主要因素是（ ）
A．分子直径的大小
B．分子间距离的大小
C．分子间引力的大小
D．分子数目的多少
影响体积大小的因素有分子直径的大小、分子间距离的大小、分子数目的多少，在一定温度和压强下，气体分子间的距离相等，因分子间距离远大于气体分子大小，则影响其所占体积大小的主要因素是分子数目的多少．
故选D．
I work in a small 1 . It is near an English school. Every day many students come to 2 things. In the morning, I get up at six, and then I 3 my breakfast. I go to work 4 . I get to the shop at about six fifty. The shop 5 at seven. We sell things 6 food and drink. We have school 7 , too. There 8 often many people in our shop from morning to evening. I have lunch in the shop. At seven in the evening the shop is 9 . All of 10 go home for supper.
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