第28题: [单项选择]7,14,16,48,51,204,( ) A. 204 B. 210 C. 205 D. 208 参考答案:D 答案解析:[解析] 7×2=14,14+2=16;16×3=48,48+3=51;51×4=204,204+(4)=(208),故选D。
第29题: [单项选择]Although ______ happened in that developed country sounds like science fiction, it could occur elsewhere in the world. A. which B. what C. how D. it 参考答案:B 答案解析:本题考查的是主语从句。What可以引导主语从句,本句中what引导的主语从句做整个句子分句的主语,同时what也是主语从句动词happen的主语。其他选项不能引导主语从句。