Bison have attacked four people at Yellowstone National Park so far this season, so the park issued a reminder that visitors are responsible for their safety.

In separate incidents, four people were injured. In the most recent incident Wednesday, a 68-year-old woman from Georgia was hiking and met a bison nearby. The woman continued on the trail and as she passed the bison, it charged and gored her. A witness reported the incident. The woman was transported by helicopter ambulance to a hospital due to serious injuries. On June 23, a 19-year-old woman from Georgia and three friends were returning to their car after a swim when they spotted a bison lying down about 10 feet from them. The three friends turned and ran from the bison. But before the woman could react, the bison tossed her in the air. The woman later went to a hospital. On June 2, a 62-year-old Australian man visiting Yellowstone was seriously injured while taking pictures. The network also notes that on May 15, a 16-year-old Taiwanese girl was gored by a bison while posing for a photo.

Nearly 5,000 bison live in Yellowstone, located mostly in Wyoming. It's the only place in the United States where the animals have lived continuously since prehistoric times. With the July 4 weekend, the nation's national parks are entering their busiest season.

“Visitors should remember that while many of the bison and elk in the park may appear tame, they are wild animals and should never be approached,” Yellowstone National Park said in a statement. “Bison can sprint three times faster than humans can run and are dangerous.” Park officials added that visitors should stay at least 25 yards away from all large animals including bison, elk, sheep and deer, and at least 100 yards away from bears and wolves. “If a visitor comes upon a bison or elk, visitors must give the animal at least 25 yards by either safely going around the animal or turning around, and not approaching the animal,” Yellowstone National Park said.

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1.Why were the four people attacked by the bison?

A Because they were too close to the bison.

B Because they wanted to pass by the bison.

C Because they hoped to run from the bison.

D Because they took pictures of the bison.

解析：选A。A。推理判断题。根据文章第二段第三句的The woman continued on the trail and as she passed the bison...和第六句的...a swim when they spotted a bison lying down about 10 feet from them.可以得知这几个人受伤的原因都是距离野牛太近了。

2.What was the girl from Taiwan doing when she was attacked by the bison?

A She was hiking in the park.

B She was swimming with her friends.

C She was lying in the grass.

D She was taking a picture.

解析：选D。D。细节理解题。根据文章第二段最后一句的The network also notes that on May 15, a 16-year-old Taiwanese girl was gored by a bison while posing for a photo可知当台湾女孩在准备拍照的时候被野牛袭击了。

3.From the third paragraph, we can know ______.

A the bison have lived on the earth for a long time

B the number of the bison is growing very quickly

C the bison want to live a very quiet and casual life.

D the bison can be really dangerous when disturbed

解析：选A。A。细节理解题。根据第三段第二句的It's the only place in the United States where the animals have lived continuously since prehistoric times可以得知野牛在地球上生活了很长时间。

4.The underlined word “sprint” in the fourth paragraph may mean ______.

A run

B approach

C appear

D remember

解析：选A。A。词意推测题。根据第四段第二句后半部分的... three times faster than humans can run可知sprint的意思为”跑”，所以该词的意思为run。

5.Which of the following animals has longest safe distance?

A The bison.

B The sheep.

C The deer.

D The bears.

解析：选D。D。细节理解题。根据文章最后一段第三句的...at least 100 yards away from bears and wolves可以得知熊的安全距离是100码，因此在那几种动物中也是最远的。