A:are visiting
B:are to visit
C:will be visiting
D:will visit
将一支高1.5cm的发光棒放置在离凸透镜15cm处,在凸透镜的另一侧的光屏上得到一个3cm高的像,则该凸透镜的焦距可能为( )
different, of, places, the, come, they, from, world(. )(连词成句)
There is a wolf on the mountain ( 山 ).