化学：不溶水和稀硝酸的白色沉淀是AgCl和BaSO4

-- What’s the weather like tomorrow?
-- The radio says it is going to be even ______.
　　A. bad B.worst C. badly D. worse
答案：D （even+比较级）

He hardly had anything to eat, ________ he?
　　A. didn’t B. hadn’t C. had D. did
　　答案：D　(选择A的同学要注意hardly表示否定；选择B和C的同学要注意，反意疑问句要用助动词.)

氢氧化铁不会使无色酚酞变红
因为他沉淀

物理：压力影响滑动摩擦而不影响静摩擦