题目

________ with teens who spend much of their free time in front of TV sets, those who are physically active often have better grades. A . Compared B . To compare C . Comparing D . Having compared 答案：A3.与中山站相比，昆仑站所在的地点A．年降雪量较大B．气压较高C．年太阳辐射较强D．年均风力较小