英语四级填空小练习
1. _______________ (随着工商业的发展),the number of trees in many big cities has dramatically reduced.
2. Travel can widen our knowledge, _____________ (扩大我们的.眼界),and make one open-minded as well.
3. Cars are responsible for most of the smog in cities, _______________ (这已经对环境造成了严重的污染).
4.Modernization will be entirely possible in the first half of the 21st century, as long as we ________________(坚持认为)that economic development is the center of all our work.
5. He was convinced on the basis of ____________(当时已出现的情况)that there would be a long and difficult struggle.
答案与解析：
1. With industries and business developing quickly
2. broaden our horizon
3. which has seriously polluted the environment
4. hold an idea/ insist on the idea/ stick to the idea
5. what had appeared by then
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