水银工作用过的废棉纱，抹布以及清除的垃圾不准（），应埋入较深的土坑内。
A.随意抛弃
B.乱扔
C.存放
参考答案：A
选择正确的词填空。
1. He is _____ (interesting/interested) in Chinese food.
2. I never go to England, _____ (does/doesn't) I?
3. We know something about different _____ (country/ countries) of the world.
4. Lin Tao is _____ (the most interesting/more interesting) boy in our class.
5. Mr. Green often takes his students _____ (to/in) a Chinese grocery store.
风心病二尖瓣关闭不全可导致（）
A.左室扩大
B.左房扩大
C.肺动脉高压
D.全心扩大
E.右室扩大
