题目

用所给动词的适当形式填空。 1. ______ (be) Mary's favourite subject Home Economics? 2. ______ she ______ (like) to learn how to cook and sew? 3. Last term he ______ (spend) a lot of time ______ (practice) his English. 4. Look! She ______ (skate) really fast! 5. David ______ (break) his arm when he ______ (play) basketball last Sunday. 答案：1. Is 2. Does, like 3. spent, practicing 4. is skating / can skate 5. broke, was playing如图1是细胞中3种化合物含量的扇形图，图2是有活性的细胞中元素含量的柱形图，下列说法不正确的是（　　） A、若图1表示正常细胞，则A、B化合物共有的元素中含量最多的是aB、若图1表示细胞完全脱水后化合物含量的扇形图，则A化合物中含量最多的元素为图2中的bC、若图1表示正常细胞，则B化合物具有多样性，其必含的元素为C、H、O、ND、图2中含量最多的元素是a，数量最多的也是a