根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    The International Climate Champions (ICC) project began in 2007. It gives young people of school age a chance to speak publicly on climate change and to call on people to take action to reduce its 1 .

    Each country involved selects three teenagers to be Climate Champions, who take part in local and international activities.Climate Champion Irene Sanna lived on the Italian island of Sardinia. Irene is interested in solar energy, and  2 believes that Sardinia should use the waves around its coast to produce electricity. 'We must make our plans to save our coast, which still has no pollution. We must protect the animals, birds and fish in danger from global warming. And we must recycle.'

    Chinese student Ding Yinghan is the Beijing Climate Champion. Ding feels it is not  3 to say that just one country - his own - is causing climate change. He says the air pollution that leads to global warming comes from many parts of the world, including poorer countries that are now growing more quickly. He believes the only way to  4 the situation getting even worse is for rich and poor countriesto work together.

    Sophia Angelis, a junior student in California, is a US Champion. She's against young people's generation lack of interest in politics and feels they need to discuss the problems that really matter to their generation. Sophia strongly believes that climate change is an important issue for her generation. For her, 5 in the way teenagers behave are an important way of influencing choices made by parents.

In 2008, the Climate Champion attended the International Conference of Environment Ministers in the Japanese city of Kobe.  6 , 30 countries are involved in the ICC, and more countries are expected to join soon.

在三角形ABC中，点D分 $\overrightarrow{BC}$ 之比为1：2，点E分 $\overrightarrow{BA}$ 分之比为2：1，设 $\overrightarrow{BC}$ = $\overrightarrow{a}$ ， $\overrightarrow{BA}$ = $\overrightarrow{b}$ ．