题目内容
20．His parents were watching TV while hewas doing（do）his homework．分析 当他做作业的时候，他的父母在看电视．
解答 答案：was doing．
根据His parents were watching TV while he--（do）his homework，可知当他做作业的时候，他的父母在看电视．while表示当…的时候，引导的句子前后都用进行时，前面是过去进行时，后面也应该用过去进行时，构成：was/were+Ving．故填was doing．
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
练习册系列答案
相关题目
10．south（ ）
| A． | round | B． | southern | C． | group | D． | enough |
11．Blue Moon is _______than other cinemas in the town，but it has the best service．（ ）
| A． | much expensiver | B． | more expensive | C． | most expensive |
8．---Would you like some juice？---___．I'm a little thirsty．（ ）
| A． | Yes，please | B． | No Problem | C． | That's OK | D． | No，thanks |
12．The woman is standing under the tree is my aunt．（ ）
| A． | what | B． | which | C． | who | D． | where |
2．Scientist Without Laboratories
When you hear the word"scitentist"，what do you think of？Many people think scientist are people in clean white coats who work in labs．And some scientists do work in labs．But there are （26）B scientist who work in woods and jungles．These scientists are called"animal behavior （行为） scientists"，and they study animals as they live in nature．
Why don't these scientists catch animals and study them in zoos？The （27）A is in the word"behavior"．Animals behavior scientists want to learn （28）C animal behave in their wild homes．When animals live in cages （笼子） or in zoos，they do not act the same as they do when they are （29）B．They may fight （30）D each other，or they may not eat，or they may not raise （抚养） their babies as they usually would．To see real animal behavior，scitentists must go where the animals （31）A．
So animal behavior scientists go into the jungles，the woods or the desert．There，their most important （32）B are their eyes and ears．They watch and listen to the animals very （33）B．They write down everything that happened in notebook．（34）C
they live near the animals，the scientists are careful not to frighten them．If the scientists are luncky，the animals will （35）A no attention to them．Then the scientists can see how the animals really live．
The behavior scientists hope what they've learned about animal behavoir can provide clues （提供线索） to help people learn to live together more happily．
When you hear the word"scitentist"，what do you think of？Many people think scientist are people in clean white coats who work in labs．And some scientists do work in labs．But there are （26）B scientist who work in woods and jungles．These scientists are called"animal behavior （行为） scientists"，and they study animals as they live in nature．
Why don't these scientists catch animals and study them in zoos？The （27）A is in the word"behavior"．Animals behavior scientists want to learn （28）C animal behave in their wild homes．When animals live in cages （笼子） or in zoos，they do not act the same as they do when they are （29）B．They may fight （30）D each other，or they may not eat，or they may not raise （抚养） their babies as they usually would．To see real animal behavior，scitentists must go where the animals （31）A．
So animal behavior scientists go into the jungles，the woods or the desert．There，their most important （32）B are their eyes and ears．They watch and listen to the animals very （33）B．They write down everything that happened in notebook．（34）C
they live near the animals，the scientists are careful not to frighten them．If the scientists are luncky，the animals will （35）A no attention to them．Then the scientists can see how the animals really live．
The behavior scientists hope what they've learned about animal behavoir can provide clues （提供线索） to help people learn to live together more happily．
| 26．A．another | B．other | C．others | D．the other |
| 27．A．answer | B．question | C．problem | D．text |
| 28．A．when | B．where | C．how | D．why |
| 29．A．happy | B．free | C．sad | D．angry |
| 30．A．of | B．among | C．for | D．with |
| 31．A．live | B．run | C．play | D．eat |
| 32．A．machines | B．tools | C．thoughts | D．ways |
| 33．A．truly | B．carefully | C．woderfully | D．nicely |
| 34．A．But | B．Unless | C．Though | D．As if |
| 35．A．pay | B．spend | C．take | D．cost． |
3．用方框中所给单词的适当形式完成短文．
Are you the only child in your family？If so，you are the most （66）important person in your parents'hearts．They are the （67）closest people to you in the world．However many teenagers （68）like you have trouble （69）communicating with their parents．They always complain（抱怨） that their parents say too much instead of listening to （70）what they're thinking．When they do （71）something wrong，getting away from parents seems to be the only （72）choice．In fact what your parents do just shows （73）love for you．They love you more than they love （74）themselves．Whenever you need help，they are always there，standing by you．Try to put yourself into their shoes，and you'll understand them （75）easily．
| choose them easy communicate important close like what something love |