问题 问答题

空气中的水蒸气看不见摸不着.现给你一块玻璃、少许冰块和干布一块,你能否做一个实验证明“空气中存在水蒸气”?要求写出简要的实验步骤.

答案

答:能.

实验步骤:将玻璃板与冰块一同放置一段时间,待玻璃板冷却后,取走冰块并将玻璃板上的水分擦干净,过一会儿会发现,玻璃板上会蒙上一层水雾.这层水雾就是空气中的水蒸气遇到冷却的玻璃板后液化形成的.

单项选择题
完形填空

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Homework is a bridge that joins schools and parents. For teachers, homework is an effective way to provide additional instruction through practice. 小题1: . Through it, parents can observe their children’s education and express a positive attitude towards their children’s education. As children grow older, homework and the amount of time engaged in homework increase in importance.

Through practice and participation in learning tasks, homework can improve children’s achievement. Thus, it would be expected that if homework were completed accurately, not only would children’s general knowledge and grades improve but they would also increase mastery of basic study skills.  小题2: .

Homework can provide other benefits. When children bring an assignment(功课)home, gather and organize necessary materials to complete the assignment, return the assignment and receive a grade, they strengthen their sense of responsibility.   小题3: . When completing homework, they will plan how long they should spend on one subject.

 小题4: . When parents become involved in the homework that kids bring from school, they are given a chance to communicate with their kids on what is happening in their school lives. A lot can be learned by parents when they sit beside their kids as they do their homework.

Finally, although we often do not consider that homework serves a school administrative(管理的)role, it offers schools an opportunity to let parents know what their children are learning.   小题5: . Homework can also fulfill an administrative role in helping schools achieve their overall job of improving students’ achievement.

A.For parents, homework serves as a window.

B.Meanwhile, they also improve their time management.

C.Reading, writing, spelling and mathematics are included.

D.Homework is actually a good way to improve family communication.E.Thus, homework can play a role by keeping parents informed about class activities.

F.They will be able to discuss the things that have been going on in each other’s lives.

G.Some websites provide tips, suggestions and solutions to common homework problems.