Soon the employees became very (skill)（）in doing such jobs.

有权收集证实犯罪嫌疑人有罪或者无罪、犯罪情节轻重的各种证据

有权讯问犯罪嫌疑人，必要时可以刑讯逼供

有权对与犯罪有关的场所、物品、人身、尸体进行勘验或检查

有权依照法律程序对刑事侦查对象的通信进行检查

仅(1)和(2)。

仅(1)和(3)。

仅(2)和(3)。

仅(1)、(3)和(4)。

系中间的纽扣

系上面两粒

全系上

全不系

如果芭蕉绿了，那么樱桃红了。

除非芭蕉不绿，否则樱桃红了。

樱桃没红，但芭蕉绿了。

或者樱桃红了，或者芭蕉没绿。

Most forest fires are caused by human carelessness or ignorance. Forest fire prevention, therefore, is mainly a problem of creating 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.

Careless smokers are responsible for thousands of forest fires each year. Many of these are started when cigarette butts(烟蒂) and matches are thrown from automobiles. Others are caused by hunter, hikers(徒步旅行者), fishermen, or woods workers who are careless in disposing of their smoking materials. The Forest Service has posted rules in many of the National Forest that prohibit smoking except in certain designated (指定的)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(危险的) area.

The most important natural cause of fire is lightning(闪电). This accounts for 11 percent of forest fires on protected and for the entire nation. In the Western States, lightning causes a much higher percentage of fires than it does in the East.

Advances in knowledge of fire weather are helping forest protection forces to know when to be alert to 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 control the lightning itself have been in process for many years, but new breakthroughs are needed for any significant reduction in the fires lightning starts.

丙及格了。

丙没有及格。

乙没有及格。

乙和丙都没有及格。