题目内容

Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.
A．into; fromB．towards; towards
C．out of; fromD．through; through
A

试题分析：考察定语从句中的介词。本题定语从句的先行词是a region of space。第一空中的介词into是由动词短语fall into…转换而来；第二空的from是有动词短语escape from…转换而来。句意：宇航员和科学家认为黑洞是太空中的一个区域，物质进入了那个区域以后就什么也逃脱不出来了。故A正确。
点评：本题是把定语从句中的介词提前到关系代词的前面，定语从句的关系词前面的介词有三种来源：先行词的固定搭配，定语从句中的固定搭配，以及根据句子的意思选择的介词。
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