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【小題1】It is our d________ (責(zé)任，義務(wù)) to try to cut back on production and reduce the amount of things we make and buy.
【小題2】Trees a________ (吸收) the carbon dioxide in the air to produce oxygen.
【小題3】People have harmed nature through a________ (農(nóng)業(yè)), fishing, hunting and tourism.
【小題4】Many countries have hesitated to give p________ (準(zhǔn)許，許可) for the production of GM foods, as they would rather be cautious with this new technology.
【小題5】I feel really g________ (內(nèi)疚的) because I made some cruel remarks too.

Don't _____ the news to the public until we give you the go-ahead (許可，準(zhǔn)許).

   A. release    B. discard    C. relieve    D. retain

. Don't _____ the news to the public until we give you the go-ahead (許可，準(zhǔn)許).

Don't _____ the news to the public until we give you the go-ahead (許可，準(zhǔn)許).

　　A. release    B. discard    C. relieve    D. retain

Don't _____ the news to the public until we give you the go-ahead (許可，準(zhǔn)許).

   A. release    B. discard    C. relieve    D. retain