英語四級填空小練習

1. _______________ (隨着工商業的.發展),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, _______________ (這已經對環境造成了嚴重的污染).

rnization 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