Is this the school ____ we visited three years ago?
A. the one
B. where
C. in which
D. /
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_____ it is known to all, English is not very difficult to learn.
A. What
B. As
C. That
D. Which
I live in the house ____ windows face south.
A. which
B. whose
C. where
D. in that
《国际危规》定义的危险货物应同时具有______。I.海洋污染物质；II.能抵御海运一般风险，但若处理不当容易造成事故；III.需要特别防护；IV.《国际危规》所列危险货物类别的性质。
A. I、II、III、IV
B. III、IV
C. II、III、IV
D. II、IV
______不属于危险品。
A. 四氯化锆
B. 含油的种子饼
C. 砷酸锌
D. 蹄角粉
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