2014届高考英语一轮复习课时作业(十六)必修3Module 4《Sandstorms in Asia》（外研版）_高考复习指南

　　20. What is the key information the author wants to give in Paragraph 1?

　　A．Plants' reaction to weather could have damaging effects on ecosystems.

　　B．The increasing speed of flowering is beyond scientists' expectation.

　　C．Climate change leads to the change of food production patterns.

　　D．Food chains have been seriously damaged because of weather.

　　21. We can learn from the study published on the Nature website that ________．flowering is 8.5 times faster than leafing

　　B．there are 1，634 plant species on the four continents________．n reducing global warming

　　D．they are growing and flowering much faster than before

　　23. What can be inferred from the last two paragraphs about the world's temperature?

　　A．It has risen nearly 0.2℃ since 1979.

　　B．Its change will lead to weather extremes.

　　C．It is 0.8℃ higher in 1979 than that of 1900.

　　D．It needs to be controlled within 2℃ in this century.

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