题目

Two men, both seriously ill, were in the same hospital room. One man was allowed to _36_ up in his bed for an hour each afternoon. His bed was _37_ the room’s only window. The other man on the other side of the room had to _38_ all his time lying on his back in bed. Every afternoon when the man by the window could sit up he _39_ pass the time by describing to his _40_ all the things he could see outside the window. “The window overlooks a _41_ with a lovely lake. Ducks and swans play on the water _42_ children sail their model boats. Young lovers walk _43_ among flowers of every co 有关我国农业面临的问题，正确的是 A．耕地增加 B．环境污染 C．水土流失 D．自然灾害