题目

下列说法中正确的是（ ） A . 当细胞内外存在浓度差时，细胞就会发生质壁分离或者复原 B . 刚萎蔫的叶片放入清水中又得到恢复的主要原因是发生了自由扩散和主动运输 C . 酒精进入毛细血管不需要载体的协助 D . 细胞膜的基本支架是磷脂双分子层，支架两侧的蛋白质的种类和数量相同 答案：C完形填空Do you often think of your parents? You may say, “Yes, I .” I buy a present (礼物) for my mother on Mother’s Day and on Father’s Day I give my father , too.” But what about the other days of the year?I have a friend whose parents live in another city. One day I went to see her. We had a nice conversation. Then she wanted to her parents. So she dialed (拨号) the number, but then she put down (放下) the phone.After about fifteen , she dialed (拨号) the number again “Hi, Mom…”Later I asked, “ did you dial (拨号) the number twice?” She smiled, “My parents are old and . They can’t get close to the telephone quickly. I always do so when I call them. I just want to give them time to answer the call.”My friend is a good girl. She is thinking of her parents. You also want to be a child, right? Please always remember to your parents, not just on some important days.1.A. will B. do C. don’t2.A. a present B. a kiss C. a cake3.A. call B. visit C. help4.A. seconds (秒) B. hours C. days5.A. Where B. What C. Why6.A. fast B. slow C. healthy7.A. little B. quick C. enough8.A. always B. never C. seldom9.A. bad B. worse C. good10.A. think of B. look after C. fight