18. — Which one is your mother? C. the D. / 德州) — ______one in a purple skirt under the big C. The C. the D. / ) 19. Mary has a bad cold. She has to stay in ______ bed. (2009湖南长沙) ) 20. ---Excuse me, what’s in _______ box? B. a; the; the C. the; the; a D. the; a; ---There’s ______ red apple and ______ orange in it. (2009贵州安顺) A. a; a; an an ( ) 21. There is __________ umbrella near the window. (2009福建莆田) B. an C. a A. the A Grandma was a wonderful story-teller, and she had a set of priceless, individually (独特地) tailored stories with which American grandparents of her day brought up children. There was the story of the little boys who had been taught complete, quick obedience (服从). One day when they were out on the grassy plain, their father shouted. “Fall down on your faces!” They did, and the terrible prairie(草原) fire swept over them and they weren’t hurt. There was also the story of three boys at school, each of whom received a cake sent from home. One saved his, and the mice ate it; one ate all of his, and he got sick; and who do you think had the best time? —Why, of course, the one who shared his cake with his friends. ( )