问题 问答题

液化石油气燃料已普遍进入现代家庭的厨房中,它的主要成分是烷烃和烯烃系列混合物,现将各物质在一个大气压下的沸点分别列表如下:

有人发现液化石油气用完后,残留在钢瓶内的液体能溶解油脂,就将它倒出来作洗涤剂,洗涤物件上的油污,这种废物利用的做法是否可取,为什么?

_______________________。

答案

不可取。从表中可知,在常温下未能汽化的残液主要是沸点相对较高的戊烷和戊烯。此两种物质在空气中较易挥发成气体,当这些气体在室内达到一定比例后,如遇明火,就会发生爆炸。

填空题
阅读理解

A year ago August, Dave Fuss lost his job driving a truck for a small company in west Michigan. His wife, Gerrie, was still working in the local school cafeteria, but work for Dave was scarce, and the price of everything was rising. The Fusses were at risk of joining the millions of Americans who have lost their homes in recent years. Then Dave and Gerrie received a timely gift-$7,000,a legacy(遗产) from their neighbors Ish and Arlene Hatch, who died in an accident. “It really made a difference when we were going under financially(经济上),” says Dave.

But the Fusses weren’t the only folks in Alto and the neighboring town of Lowell to receive unexpected legacy from the Hatches. Dozens of other families were touched by the Hatches’ generosity. In some cases, it was a few thousand dollars; in others, it was more than $100,000.

It surprised nearly everyone that the Hatches had so much money, more than $3 million—they were an elderly couple who lived in an old house on what was left of the family farm.

Children of the Great Depression, Ish and Arlene were known for their habit of saving. They thrived on(喜欢) comparison shopping and would routinely go from store to store, checking prices before buying something.

Through the years, the Hatches paid for local children to attend summer camp when their parents couldn’t afford it. “Ish and Arlene never asked if you needed anything.” says their friend Sandy Van Weelden. “They could see things they could do to make you happier and they would do them.”

Even more extraordinary was that the Hatches had their farmland distributed(分送). It was the Hatches’ wish that their legacy—a legacy of kindness as much as one of dollars and cents —should enrich the whole community (社区) and last for generations to come.

Neighbors helping neighbors—that was Ish and Arlene Hatch’s story.

64. According to the text, the Fusses ____________.

A. were employed by a truck company              B. worked in a school cafeteria

C. were in financial difficulty                            D. lost their home

65. Which of the following is true of the Hatches?

A. They gave away their possessions to their neighbors.

B. They left the family farm to live in an old house.

C. They had their children during the Great Depression. 

D. They helped their neighbors to find jobs.

66. Why would the Hatches routinely go from store to store?

A. They decided to open a store.                   B. They wanted to save money.

C. They couldn’t afford expensive things       .      D. They wanted to buy gifts for local kids.

67. According to Sandy Van Weelden, the Hatches were _________.

A. mean                  B. childlike                   C. curious                    D. understanding