过滤式自救器是防止（）气体中毒的呼吸装置。
A.甲烷
B.一氧化碳
C.二氧化碳
参考答案：B
—What kind of book does he like reading?
—He likes reading the books _____ are about history.[ ]
A. when
B. who
C. where
D. that
“种豆南山下，草盛豆苗稀”的后两句是什么？
