老师，拍照太麻烦，我直接把答案写在这里
150页B：4，5，5，3，2，6
152页A：1.Scientists are now very worried about two of the earth's most important resources.
2.Water pollution is not the only cause of dwindling water supplies.
3.Grain harvests in India have decreased because of water shortage.
4.Rainforests are important because they put out oxygen and take in carbon dioxide.
5.Reducing people's consumption of meat can help to save the rainforest.
B：1.W,R 2.W,R 3.W,R 4.R 5.W,R
C：In order to let the readers know how important the water is, why people need to protect water resources.
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