Question

The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.

A．which

B．that

C．as

D．what

Answer 1

B

试题分析：考查名词性从句的同位语从句。本题的That引导同位语从句that the earth is becoming warmer and warmer these years解释名词the fact的内容，句意：这些年来地球变得越来越热这个事情让很多科学家很担忧。That在同位语从句中不充当任何成分，只起引导作用。故B正确。
点评：名词性从句的考查集中在引导词的选择上，连接词that, whether, if在句中不充当任何成分，只起连接作用；连接代词who(ever), which(ever), whom(ever),whose(ever),what(ever)在句中做主语，宾语，表语和定语；连接副词when, why, where, how，在句中做状语。应从上下句的句法关系着手分析，切不可‘望句形生答案’总的来说，考生在解答此类型时，可用排除法或造句法，造句法就是仿造原句的语法功能仿造出一个易懂易理解的句子，帮助判断。