活动盖口设置在什么部位？
参考答案：
活动盖口设置在池盖的顶部，盖口的大小以能容纳一个成人进、出沼气池为宜。
— Is there _______ in today's newspaper?
— Yes. A group of ________ kids joined the volunteers!
A．anything new; ten-year-old
B．something new; ten-years-old
C．anything new; ten-years-old
D．something new; ten-year-old
世界卫生组织把哪三种疾病列为世界范围内应重点防治的慢性非传染性疾病？
