工资率上升的收入效应导致闲暇消费的（），而其替代效应导致闲暇消费的（）。 A.减少； 发布时间：2017-06-22 22:08 │ 来源：www.tikuol.com 题型：单项选择题 问题： 工资率上升的收入效应导致闲暇消费的（），而其替代效应导致闲暇消费的（）。A.减少；减少B.减少；增加C.增加；减少D.增加；增加
题型：单项选择题 阅读理解。 Have you ever (曾经) seen snow? A lot of people in the world have not. A lot of countries never have snow. In the north of England, there is quite a lot of snow every winter, but in the south of England, thereis usually little snow. When a student from a warm country comes to England in the autumn for the first time, he feels coldat first. There are often dark clouds, grey skies and cold rain in England in autumn, and most students fromwarm countries do not like this kind of weather. But snow is different. It is very cold, but it is very beautiful. After a few dark mornings, the student wakes up one day and there is a lot of light in his room. He thinks, "It must be late," and gets up quickly.But no, it is not late at all. He looks out of the window and there is snow everywhere. The light in the roomcomes from that clean, beautiful white snow. 1. Many people ______. [ ]A. have ever seen snow B. have never (从来没有) seen snowC. often see snowD. see snow once a year 2. There is usually ______ snow in the south of England. [ ]A. a little B. much C. a few D. little 3. When a student from a ______ country comes to England in the autumn, he feels ______ at first.[ ]A. hot; cold B. warm; cold C. warm; hot D. hot; warm 4. Most students from warm countries ______.[ ]A. like the weather in EnglandB. don't like the weather in England C. don't like snow D. often see snow in their countries 5. There is a lot of light in the room because ______. [ ]A. there is a lamp (灯) B. it is daytime C. it is fine D. there is snow outside 查看答案
题型：单项选择题 在玉米中，有三个显基因A、B、R对种子着色是必须的。基因型A__B__R__是有色种子，其他基因型皆无色。一有色植物与aabbRR杂交，产生25%有色种子；与aaBBrr杂交产生25%有色种子；与AabbRR杂交，产生37.5%有色种子。这一有色植物的基因型为（）A.AaBBRrB.AABbRrC.AaBbRrD.AABBRR 查看答案