问题 填空题

燃料的燃烧在人类社会的发展中起着相当重要的作用.

(1)下面是人类大规模使用燃料的大致顺序:木柴→木炭→煤→石油、天然气.

①上述燃料中属于化石燃料的是______;这些化石燃料属于______能源(填“可再生”或“不可再生”);上述燃料中通常被称为“清洁能源”的是______.

②天然气的主要成分是(填化学式)______,其完全燃烧的化学方程式为:______.

(2)为了提高煤的燃烧利用率,通常把煤制成蜂窝状,目的是______.

(3)现代社会对能量的需求量越来越大,化学反应提供的能量已不能满足人类的需求.人们正在利用和开发新能源,如______.(举一例)

答案

(1)煤、石油、天然气属于化石燃料,属于不可再生能源,天然气燃烧的生成物是二氧化碳和水,不污染环境,是一种清洁能源;

故答案为:

煤、石油、天然气;不可再生;天然气;

(2)天然气的主要成分是甲烷,化学式是CH4,甲烷和氧气在点燃的条件下生成二氧化碳和水;

故填:CH4;CH4+2O2

 点燃 
.
 
CO2+2H2O;

(3)将煤制成蜂窝状,目的是增大煤与氧气的接触面积,促进燃烧;

故答案为:增大煤与氧气的接触面积,使之充分燃烧;

(4)人们正在利用和开发的新能源由太阳能、地热能、核能、潮汐能等;

故答案为:太阳能等.

选择题
阅读理解

In 1955, a man named Raymond Kroc entered a partnership with two brothers named Mcdonald. They operated a popular restaurant in California which sold food that was easy to prepare and serve quickly. Hamburgers, French fries, and cold drinks were the main foods on the limited menu. Kroc opened similar eating places under the same name, “McDonald’s” and they were a quick success. He later took over the company and today it is one of the most famous and successful “fast-food” chains(连锁店) in America and the world.

Why was his idea so successful? Probably the most important reason was that his timing was right. In the 1950s, most married women stayed home to keep house and take care of their children. During the 1960s, the movement for equality(平等) between men and women and an economy(经济) that needed more families to have two money-earners resulted in many women returning to the workplace. This meant that they had less time and energy to do housework, so they depended more on fast-food restaurants.

Single parents also have little time to spend in the kitchen. People living alone because of divorce(离婚) or a preference for a “single lifestyle” also depend on this type of food, since cooking for one is often more trouble than it is worth.

Fast food is not part of the diet of all Americans. Another of the 1960s was called back-to-nature movement. More and more Americans based their diets on natural foods. This preference for natural foods continues to this day. These products can now be found not only in the special health food store but also in many supermarkets.

小题1:The passage is mainly about ____.

A.how and why “McDonald’s” became successful

B.the effect social and economic changes have on people’s eating habits

C.why Americans prefer natural food

D.American eating habits小题2:Which of the following was NOT a reason for Raymond Kroc’s success?

A.His partnership with the McDonald brothers.

B.A changing economy.

C.The back-to-nature movement.

D.Women’s equality movement.小题3:We can infer from the passage that ____.

A.natural foods can also be found in McDonald’s

B.many married women in America returned to work in the 1960s

C.McDonald’s fast food is popular among the young

D.divorce caused people to change their eating habits