一个理想的股份指数至少具备的特点有（）。 A.波动要频繁 B.能够充分反映各行业的比

发布时间：2017-06-13 21:49 │ 来源：www.tikuol.com

题型：多项选择题

一个理想的股份指数至少具备的特点有（）。

A.波动要频繁

B.能够充分反映各行业的比重

C.能够反映整体股市的表现状况

D.包含有足够的市场价值

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完形填空。
Jane is a nice girl and she likes small animals. On her way back from school __1__afternoon, she always stops__2__ the animals in the pet(宠物)shop. She likes to see the dogs. One of them is a little white dog,and Jane likes it__3__.She__4__the dog __5__ in the pet shop. She often forgets(忘记)the time. So she comes home very__6__. One day her parents asked 7__she was late. Jane told them about the dog in the pet shop. The next day Jane stopped to look __8 _ the window of the pet shop,but she could not__9 _the dog. She was very sad and went home early. When she _ 10__home,her mother showed her a big cake and her father gave her the little white dog from the pet shop. It was her birthday. Jane was very glad. From that day, she did not come home late. She ran home early to play with the little white dog every day.
( )1. A. each one ( )2. A. looking at ( )3. A. very many ( )4. A. watches ( )5. A. to play ( )6. A. late ( )7. A. what ( )8. A. at ( )9. A. looked ( )10. A. got	B. every B. looks at B. very much B. watch B. play B. early B. why B. to B. looked at B. got to	C. this C. to look at C. very C. see C. played C. fast C. when C. into C. saw C. arrived in	D. ／ D. looked at D. 1itde D. saw D. plays D. first D. where D. onto D. see D. arrived at

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什么是反射定律？

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如图所示，有三块截面为等腰直角三角形的透明材料（图中的Ⅰ、Ⅱ、Ⅲ）恰好拼成一个正方形棱镜．从E点垂直于边射入的单色光在F处发生全反射，在G、H连续发生两次折射后射出．若该单色光在三块材料中的传播速率依次为v₁、v₂、v₃，下列关系式中正确的是（　　）

A．v₃＞v₁＞v₂

B．v₂＞v₃＞v₁

C．v₃＞v₂＞v₁

D．v₁＞v₂＞v₃

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下列属于复杂反射的是（　　）

A．缩手反射

B．排尿反射

C．眨眼反射

D．听到铃声走进教室

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大气是层结流体，大气的密度分布随高度变化，通常来说（）大气中容易产生重力内波。

A.不稳定层结

B.稳定层结

C.中性层结

D.分层层结

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