_______ is even important is ______ as the earth cooled down, water began to appear on its surface.
A．That, that
B．What, that
C．What, what
D．It, that
答案：B
题目分析：考查名词性从句：句意：甚至更重要的是，随着地球冷却下来，水开始出现在它的表面。第一空是what引导的主语从句，what在主语从句中做主语，第二空是that，连接表语从句，因为表语从句是完整的，不缺成分，选B。
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| Japanese high school students do not drive cars. Many of them either walk 1 ride bicycles if the distance is not too great. In other 2 , a lot of students have to 3 public buses and trains, often changing lines several times in order to reach their 4 . It is common for some students to 5 two or more hours each day on 6 transportation. After junior high school, students attend schools based 7 standardized high school entrance examination scores. As a result, some students travel a great distance to 8 the school. The school day begins at 8:30, so students may leave home 9 6:30. While some students sleep or study during their long travel, public transportation also 10 a chance for socializing with peers (同龄人). Students 11 to school are regulated by school policies. These policies may prohibit 12 activities in public -chewing gum, consuming snacks, 13 books while walking - anything that might reflect 14 on the reputation of the school. Each school has a unique 15 that makes its students easily identifiable to 16 . School policies often require students to 17 on buses and trains, 18 seats open for other passengers in order to show thoughtfulness towards others. In practice, 19 , students tend to relax 20 they move farther away from school. | ||||
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