at the top of, continue, plenty, high, invention
在相同时刻的物高与影长成比例,如果高为1.5米的测竿的影长为2.5米,那么影长为30米的旗杆的高是( )
---I think Ma Lin will win the first prize.---_____________. I think Wang Liqin will be the top of the game.
长白山地主要的经济活动是( )