A:to blow dow
B:blowing dow
C:blown dow
D:being blown dow
霜冻多出现在晚秋或冬季晴朗的夜晚,主要是因为此时( )
________she walked, she dropped the seeds along the road so that she would know the way back.
如图,直线m∥n,△ABC为等腰三角形,∠BAC=90°,则∠1=____°.