5. The emperors build the wall to protect China.(就画线部分提问) 

   the emperors build the wall?

4. I think Tom is the youngest student.(改为否定句)

3. Russia is larger than the US,and the US is larger than China.(改为同义句) 

  Russia is of the three.

2. China has the largest population in the world.(就画线部分提问)

    has the largest population in the world?

IV.按要求完成句子

1. The Nile is 6 ,671 kilometers long.(就画线部分提问)

   is the Nile?

() 5. China is than any country in the world.

   A. many long   B. much older

   C. much larger   D. lot older

() 4. —Which city has population,China,India or England?

    —England,of course.

   A. the most   B. the least

   C. the largest   D. the smallest

() 3. ，he stopped writing when he retired.

   A. As far as I see

   B. As long as I see

   C. As long as I know

   D. I know

() 2. Feel when you are speaking in public.

   A. free   B. anxious

   C. nervous   D. worried

Ⅲ.单顶选择

() 1. Hainan province attracts many every year.

   A. tour   B. tourists

   C. traveler   D. tourist