英語四級填空小練習

　　1. _______________ (隨著工商業(yè)的發(fā)展),the number of trees in many big cities has dramatically reduced.

　　2. Travel can widen our knowledge, _____________ (擴大我們的.眼界),and make one open-minded as well.

　　3. Cars are responsible for most of the smog in cities, _______________ (這已經(jīng)對環(huán)境造成了嚴重的污染).

　　4.Modernization will be entirely possible in the first half of the 21st century, as long as we ________________(堅持認為)that economic development is the center of all our work.

　　5. He was convinced on the basis of ____________(當時已出現(xiàn)的情況)that there would be a long and difficult struggle.

　　答案與解析：

　　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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