题目内容
【C18】
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The United Nations Environment Program says that air pollution reduces the amount of crops produced, h also reduces the nutrient level of crops. As a result, both the buyer and the seller of crops are hurt by air pollution.
The UN says dirty air is a major source of metal in crops. These metals include lead, zinc and copper. These metals can build up to dangerously high levels in the parts of plants that people eat. The German Appropriate Technology Exchange, GATE, reports that eating these metals can cause developmental problems and low intelligence levels among children. Some kinds of cancers and kidney damage have also been linked to metals in crops.
Who is hurt by air pollution？
【C11】
国际工程投标报价中，暂定金额的处理方式是()决定其使用发式和额度。
听力原文： In countless other ways, the people of the United States are indebted to the Mexicans who once lived in the old Southwest. There were only 75 thousand of them when Mexico ceded the region to the United States, and these were scattered from the Gulf Coast in the east to the shores of the Pacific in the west. They had lived in the borderlands since 1598, more than twenty years before the Pilgrims sailed for the New World. In the course of more than 250 years, they had left their mark on the land. Many of the western states in the United States still bear the lovely lyrical names the Mexican settlers first wrote upon their maps. So do countless rivers and mountains, and thousands of cities and towns. Through trial and error, the rugged Mexicans had learned to survive and proper in the dry, half-desert land. When English-speaking people poured into the region, the Spanish-speaking people shared their knowledge with the new settlers, making things much easier fro them. Settlers in other parts of the United States did not have this advantage.
What does the map mean？
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