Ⅲ. 句式填空1. -ing 分词作状语和定语Looking ahead （展望未来） , scientists believe that global warming could be one of the biggest environmental problems facing the 21st century （ 21 世纪所面临的） . 2. It seems that. . . 句型“似乎……，好像……”Given this data, it seems that ( 好像 )the link between human activities and rising global temperatures is not merely a coincidence. 3. 条件状语从句的省略If necessary ( 如果有必要的话 ), give reasons for your answers. 4. not only. . . but (also). . . 不但……而且……Rivers, lakes, and wet-lands are sources of fresh water, not only ( 不但 )for humans, but ( 而且 ) for wildlife as well. Ⅳ. 教材设题1. The water level has risen ______ high in several places ______ many homes are at risk from flooding. A. so; that B. such; thatC. so; as to D. such; as to 【解析】选 A 。本句中的 high 为形容词，需要用副词修饰，而 so. . . that 句型中， so 为副词，修饰形容词，故 A 项正确。 2. Which countries do you think _______ more to global warming? A. adapt B. belong C. relate D. contribute【解析】选 D 。 contribute to. . . 为固定短语，此处表示“导致，在……方面起作用”的意思，其他不合题意。 3. Global warming is _______ due to human activities. A. most B. mostly C. nearly D. almost【解析】选 B 。 mostly 用作副词，意为“主要地，大部分地”。此处指全球变暖主要是由人类活动引起的。 4. Because these natural disasters _____ at random times, it is difficult to warn people ______ . A. occur; in advance B. take place; beforehandC. break out; ahead of time D. occur; in advance of it【解析】选 A 。 occur 表示“发生”，强调“出乎意料”；take place 强调“按照事前的计划或安排而发生”； break out 强调“战争、火灾等”的突然爆发；由此可排除 B 项和 C项。根据句意：由于这些自然灾害不定时地发生，所以很难提前警告人们。故 A ...
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