俄罗斯的主要气候类型是( )
A:温带海洋性气候
B:温带季风气候
C:极地气候
D:温带大陆性气候
小明在玻璃杯内盛满水,杯口盖上一张硬纸片(不留空气),然后托住纸片,将杯子倒置或倾斜,水都不流出,纸片也不掉下(如图所示)。对整个探究活动的分析正确的是9)
— How much are the two pairs of trousers?— They are not expensive. I think one hundred dollars ______ enough.