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單項選擇題

recent report sys thtll se wter will hve been polluted by 2040.The; theB

．________ recent report sys thtll ________ se wter will hve been polluted by 2040.The; the B．The; 不填 C．; the D．; 不填A．The; theB．The; 不填C．A; theD．A; 不填

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單項選擇題

If powerful mesures ______, thisre would hve been bdly polluted.ren’t tkenB．hveIf powerful

mesures ______, thisre would hve been bdly polluted.ren’t tken B．hven’t been tken C．weren’t tken D．hdn’t been tkenA．a(chǎn)ren’t takenB．haven’t been takenC．weren’t takenD．hadn’t been taken

單項選擇題

This infection happens through sexual contact and by ___ needles that have been polluted with infected blood.

A．sharingB．owningC．using