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考点规范练33(选修7 Unit 3) .阅读理解 A new system has been developed to measure the health of the world’s oceans.Scientists say the system will change the way we think about oceans and how they affect our lives.It is called the Ocean Health Index.The index is designed to tell if anything is wrong with the oceans and,if so,what can be done about it. Whether you live in the United States or in the middle of Africa,you should care about what happens to the oceans. Most of the oxygen that you breathe comes from the ocean.The oceans are the primary climate adaptation system.They absorb carbon.If you want to know what the Earth would be like without an ocean you’ve got plenty of examples in our solar system—all those hot,dusty,dry,cold inhospitable(荒凉的) places are basically that way because they do not have a liquid ocean to provide all these benefits,including food.One out of four people on the planet get their daily source of protein from the ocean. The Ocean Health Index uses two hundred separate measurements.Once a year,scientists will use it to announce whether the oceans successfully passed the test. People have looked to nature for medicines since ancient times.And modern scientists have searched the world’s rainforests for new medicines.But the ocean may be an even better source.At least twenty-six drugs that come from sea organisms(有机体) are currently being used or developed.And a new generation of chemists hopes to increase that number.Many drugs are in development,and there will be many discoveries of ocean-based medicines. | 
