题目

1. The river which is 2,000 metres long runs through our city.   The river which is 2,000 metres ____________  _____________ runs through our city. 2. It is said that the paper was invented in China.   The paper is said __________  __________   __________ ___________ in China. 3. Suddenly he came up with a good idea.   A good idea ______________  ____________ him suddenly. 4. The new square is five times bigger than the old one.   The new square is five times _________  ___________   ______________ the old one. 5. He knows nothing about the incident in the office at all. 以矩形的一边所在的直线为旋转轴，其余三边旋转一周形成的面所围成的旋转体是（ ）A．球B．圆锥C．圆柱D．圆台