题目

Freerice is an interesting game. Remember to play it when you are free. It can help the hungry around the world. How to play In the middle of the Freerice Home page you will see something like:               small means:                           little                           old                           big                           yellow Click on one of the four words that you think is correct. If you get it right, Freerice donates 10 grains of rice to help the来自海洋深处的可燃冰的主要成分是 [     ]A．CH4 B．H2 C．COD．CO2