One advantage of space based solar power system is that it is economical.

• A、Right
  
  

• B、Wrong
  
  

• C、Not mentioned
  
  

第七部分:短文写作(第51题,30分)

51.请根据下列材料写一篇150 词左右的英语短文。

We cannot fail to notice that countless uncivilized behaviors exist in our daily lives, such as spitting, talking loudly, littering, saying nasty words in public places and so forth. What will you do in public?

Solar-power satellites will use radio waves to beam energy down form space.

• A、 Right

• B、Wrong

• C、Not mentioned