單項(xiàng)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

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單項(xiàng)選擇題

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

A．sharingB．owningC．using

單項(xiàng)選擇題

Hepatitis B and C are even more easily ___ in blood and needles that HIV.

A．to passB．passedC．pass