Bajin is considered to be a great writer 2.科学家们正在进行一项重要的实验（carry out）The scientists are carrying out an important experiment 3.越来越多的美国人开始担心自己的安全（worry）More and more American
In the last few decades, scientists have reached consensus and reported that human beings are causing changes in the Earth’s climate — something previously seen as beyond our control.。They claim that in th
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