Most forest fires are caused by human carelessness, negligence, or ignorance. Forest fire prevention, therefore, is mainly a problem of creating a better understanding of the importance of forests, an awareness of the danger of fire in the woods, and a sense of personal responsibility to safeguard the forests from danger. This is not an easy job. A city dweller, used to paved street, does not easily change his smoking habits when he goes into the woods.

Careless smokers are responsible for thousands of forest fires each year. Many of these are started when cigarette butts and matches are tossed from automobiles. Others are caused by hunters, hikers, fishermen, or woods workers who are careless in disposing of their smoking material. The Forest Service has posted rules in many of the National Forests that prohibit smoking except in certain designated areas. Many of the states have laws against throwing lighted materials from automobiles. The prevention of smoker-caused fires, however, depends upon changing the attitudes and behavior of millions of people who smoke in hazardous area.

The most important natural cause of fire is lightning. This accounts for 11 percent of forest fires on protected land for the entire nation. In the western states, lightning causes a much higher percentage of fire than it does in the east.

Advances in knowledge of fire weather are helping forest protection forces to know when to be alert for lightning-caused fires. Adequate and well-equipped forces can control them quickly and hold the damage to a minimum. Experiments in “seeding” thunder clouds to prevent or control the lightning itself have been in process for many years, but new breakthroughs are needed for any significant reduction in the lightning starts.

　　 1. The passage is chiefly about

　　　　 A. smoking in forests

　　　　 B. the chief cause of forest fire and their prevention

　　　　 C. changing the attitudes and behavior of millions of people

　　　　 D. advances in knowledge of fire weather

　　 2. Preventing smoker-caused forest fires is mainly a problem of——.

　　　　 A. building the proper knowledge and habits in human beings

　　　　 B. safeguarding the forest from fire

　　　　 C. posting rules in forests

　　　　 D. holding the damage to minimum　　　　　　　　   　　

　　 3. Lightning-caused fires can be controlled quickly by——.

　　　　 A. hunters and woods workers　　　　　　   B. responsible smokers

　　　　 C. adequate and well-equipped forces　　　　 D changing people's habits

　　 4. Which of the following statements is not true?

　　　　 A. The chief causes of forest fires are human carelessness, negligence, or ignorance.

　　　　 B. Lightning, the important natural cause of forest fire, can be prevented or controlled by men.

　　　　 C.  Quite a few states in America have laws against throwing lighted materials from automobiles.

　　　　 D. “Seeding” thunder clouds are a good way to prevent forest fire.

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Hidden passengers travelling in ships, trains, or even cars can be a terrible trouble——especially when they are insects. As for this, there is a great _____1_____ between human beings and insects. The former _____2_____ every possible effort to avoid being discovered ,while the latter quickly _____3_____ attention to themselves.

　　We can only show mercy to the _____4_____ man who had to stop his car soon after _____5_____ from a country village to drive to London. Hearing a strange noise from the _____6_____ of the car, he naturally got out to _____7_____ the wheels carefully, but he found nothing wrong, so he _____8_____ his way. Again the noise began _____9_____ and became even louder. Quickly _____10_____ his head, the man saw what appeared to be a great _____11_____ loud following the car. When he stopped at a village further on, he was told that a queen bee must be hidden in his car as there were thousands of bees_____12____ .

　　On learning this, the man drove away as quickly as possible. After an hour's _____13_____ driving, he arrived safely in London. Where he parked his car outside a _____14_____ and went in. It was not long _____15_____ a customer who had seen him arrive _____16_____ in to inform him that his car was _____17_____ with bees. The poor driver was _____18_____ that the best way should be to call a _____19_____. In a short time the man arrived. He found the unwelcome passenger hidden near the wheels at the back of the car. Very thankful to the driver for this _____20_____ gift, the bee-keeper took the queen and her thousands of followers home in a large box.