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※【拓展提升】“amassof＋n.”作主语时，谓语动词用单数；“massesof＋n.”作主语时，谓语动词用复数。【针对练习】单句语法填空(1)Shehasamass________thingstodo.(2)Look!There________(be)massesofdarkcloudsinthesky.【答案】(1)of(2)are(注：本书中凡带※符号的内容均供学有余力的读者自行选用)6．explorevt.探究；探讨；探险Paraphrase:todiscussorthinkaboutsomething