关于美国农业带序号与名称对应都正确的是（     ）

生态平衡是指生态系统中的各种生物（  ）

假如你是李华，你的好友Tom不善于交际，来信总是向你诉说他在交往方面的烦恼，请你就此向你的朋友提出一些建议。建议内容包括以下几点：

1）宽容；

2）多微笑；

3）和别人在一起时，不要保持沉默。

注意：1）.词数120左右。

2）．可适当增添细节，以使行文连贯。

Dear Tom，

    ……

Yours，

Li Hua

B

    A boy and his father walk in the mountains. Suddenly the boy falls, hurts himself, and cries, "AAAhhhhhhhh!!!" To his surprise, he hears the voice(声音) repeating(重复), somewhere in the mountain, "AAAhhhhhhhh!!!" Then the boy cries again, "Who are you?" He hears the answer "Who are you?" He thinks someone else in the mountain is laughing at him, so he gets angry and shouts "Foolish!" He receives the answer "Foolish!"

    He looks at his father and asks, "What's going on?" The father smiles and says, "My son, listen." And then he shouts to the mountain, "I love you!" The voice answers, "I love you!" Again the man cries, "You're the best!" The voice answers, "You're the best!"

    The boy is surprised, but does not understand. Then the father explains(解释), "People call this 'Echo', but really this is life. It gives you back everything you say or do. Our life is just a reflection（反映）of what we have done. If you want more love in the world, have more love in your heart. If you want to be successful(成功), work hard. This can be used in everything in life. Life will give you back everything you have given to it."