问题 填空题

用字母序号填空:

a.CO2  b.Ca(OH) 2  c.CaO  d.NaHCO3  e.NaCl  f.O2

常用作食品干燥剂的是    ;可改良酸性土壤的是       ;用于运动饮料生产的气体是    ;可作调味品的是    ;用于焙制糕点的是    ;可供给呼吸的是    

答案

c  b  a  e  d  f

题目分析:根据常见物质的性质分析。

CaO易于空气中的水反应,故常用作食品干燥剂,故选c;

Ca(OH) 2属于碱,可用于改良酸性土壤,故选b;

CO2能与水反应,生成碳酸,常用于运动饮料的生产,故选a;

NaCl有咸味,是常用的调味品,故选e;

NaHCO3是发酵粉的主要成分之一,可用于焙制糕点,故选d;

O2可供给呼吸,故选f。

点评:物质的性质决定物质的用途,熟记物质的性质,是解题的关键,要求学生在平时的学习中要加强基础知识的学习。

阅读理解

阅读理解。

     In America, drivers' education is part of the regular high school curriculum (课程). Every student in his

or her second year of high school is required to take a class in driver's education. However, unlike other

courses, it is not given during the regular school year. Instead it is a summer course.

     The course is divided up into two parts: class time for learning laws and regulations, and driving time to

practise driving. Class time is not unlike any other class. The students study the basic traffic laws from a text

to pass the written driving test that is given to anyone who wants to get a driver's license.

     Driving time is a chance for the students to get behind the wheel (steering wheel) and practise starting

steering, backing up, parking, switching lanes, turning corners, and all the other maneuvers (操作) required

to drive a car. Each student is required to drive a total of six hours. The students are divided up into groups

of four. The students and the instructor go out driving for two hour blocks of time. Thus, each student gets

half an hour driving time per outing. The instructor and "driver" sit in the front seats and the other three

students sit in the back.

     After the student has passed the driver's education course and reached the appropriate age to drive (this

age differs in every state but in most cases the person must be 16 years old), they can go to a designated (指

定的) state office to take their driver's test, which is made up of an eye examination, a written test, and a

road test. The person must pass all three tests in order to be given a driver's license. If the person did well in

his or her driver's education class, he or she will pass the test with flying colors and get a driver's license.

1. In America, the driver's course mentioned above _____. [ ]

A. is considered as part of the advanced education

B. is given to anyone wanting to get a driver's license

C. is carried on at the same time as other courses

D. is offered to all the students of Grade 2 in high schools

2. We can infer that the students are required to _____ in their whole driving practice. [ ]

A. spend at least six hours driving

B. get half an hour driving

C. drive for two hour blocks of time

D. go out driving for twelve times

3. Which of the following is Not True for the students wanting to get their driver's license?[ ]

A. They must have their eyes examined.

B. They must be 16 years of age.

C. They should go to have their driver's test.

D. They ought to do well in their driver's course.

4. In the last sentence, "with flying colors" means _____.[ ]

A. happily

B. quickly

C. colorfully

D. successfully

单项选择题