问题 选择题

下列物质的性质中属于化学性质的是(  )

A.水是无色的液体

B.金刚石硬度很大

C.汽油可以燃烧

D.食盐有咸味

答案

物质的颜色、状态、气味、熔点、沸点、硬度、密度等性质,不需要发生化学变化就表现出来,因此,都属于物理性质.

A、水是无色的液体是物质的颜色和状态,属于物理性质,故A错;

B、金刚石硬度很大指的是物质的硬度,属于物理性质,故B错;

C、汽油燃烧生成二氧化碳和水等物质,属于化学变化,故汽油可以燃烧属于化学性质,故C正确;

D、食盐有咸味是物质的味道,属于物理性质,故D错.

故选C.

阅读理解

阅读理解。

     Directions: Read the passage carefully. Then answer the questions or complete the statements in the

fewest possible words.

     In our culture, the sources of what we call a sense of "mastery" -feeling important and worthwhile-and

the sources of what we call a sense of"pleasure"-finding life enjoyable-are not always the same. In the past

women often were told"You can't have it all." Sometimes what the speaker really is saying is: "You choose a

career, so you can't expect to have closer relationships or a happy family life." or"You have a wonderful

husband and children-what's all this about wanting a career?" But today women need to have two aspects of

well-being, if they are to feel good about themselves.

     Our study shows that, for women, well-being has two aspects. One is mastery, which includes

self-respect, a sense of control over your life, and low levels of anxiety and depression. Mastery is closely

related to the"doing" side of life, to work and activity. Pleasure is the other aspect, and it is made up of

happiness, satisfaction and optimism. It is tied more closely to the"feeling" side of life. The two are

independent of each other. A woman could be high in mastery and low in pleasure, and vice versa. For

example, a woman who has a good job, but whose mother has just died, might be feeling very good about

herself and in control of her work life, but the pleasure side could be damaged for a time.

     The concepts of mastery and pleasure can help us identify the sources of well-being for women, and

correct past mistakes. In the past, women were encouraged to look only at the feeling side of life as the

source of all well-being. But we know that both mastery and pleasure are important. And mastery seems to

be achieved largely through work. In our study, all the groups of employed women were valued significantly

higher in mastery than women who were not employed.

      A woman's well-being is developed when she takes on multiple roles. At least by middle adulthood, the

women who were involved in a combination of roles-marriages, motherhood, and employment-were the

highest in well-being, in spite of warnings about stress and strain.

1. What is the best title for the passage? (no more than 10 words)

________________________________________________________________________

2. According to the writer mastery means ______ and pleasure means _________.(no more than 10 words)

3. What is the main idea of the Second Paragraph? (no more than 8 words)

________________________________________________________________________

 4. The underlined word"it" (Line 4, Para 2) refer to _______. (1 word)

单项选择题