【正文】 es the food. Studies are being done to try to find answers. As in every good science process, the debate continues. 1. Which one is not true about radiation? ( ) A. Radioactivity can be used in many ways. B. With radiocarbon dating, we could know the possible year when a dinosaur died billions of years ago. C. Radioactivity could make contribution to people though it is dangerous. D. Food preserved with radiation may not be safe because it is changed by radiation. the meaning of the underlined word. tumors. ( ) A. medicine B. illness C. cancer D. cells best title for this passage should be ________.( ) A. The many uses of Radioactivity B. Radioactivity and cancer C. Radiocarbon dating D. Radiation is harmful. 小結(jié)與反 思 :_______________________________________________ 。 班級 :_________ 姓名 :__________ 層次 :_______ Unit22Environmental Protection導(dǎo)學(xué)案 (1) Lesson1—Global Warming Can we take the heat?(1) 編寫人：王素仙 審核：高二英語組 Common sense: Global warming means an average increase in