题目内容：

    With a bag on his back and his hands in his pockets, Ye Tian sneaked around the fence,trying to find an entrance to the abandoned coking works without being noticed.

However, a guard dog gave Ye second thoughts. I'm not afraid of the gatekeeper-at least I can negotiate with him. But a dog? Forget it. I'll find another way. "While planning his special(uninvited)visit to the Beijing site, the 25-year-old did some research, but still failed to locate the entrance.

Ye is among the thousands who are interested in “taking adventures”, which they call urban exploration, or “urbex”. The aim is to explore structures-usually abandoned ruins or “hidden components of the man-made environments”.

Venturing into abandoned structures is one of the most common examples of urban exploration. Although targets vary from one country to another, high-profile abandoned structures usually include amusement parks, factories, power plants, missile silos, fallout shelters, hospitals, asylums, schools and houses.

Urban explorers are interested in visiting such sites, as they can discover “other parts of a city”and get to understand its history from a different angle.

Ye, who worked as an intern for a German company in Beijing for six months, said he enjoyed the contrast between the city's two sides- modern and crowded, compared with old-fashioned and silent-and wanted to learn more about the capital during his short stay.

Ye said that he was able to finally sneak in through another entrance, yet he was still asked to leave by a gatekeeper shortly after. But he then managed to get into a newly built residential block, climbed to the top and took a picture of the factory ruins at sunset.

“I will come back another day,” he said.

1.What do we know about Ye Tian in the passage?

A.He enters a place easily every time.

B.He loves exploring natural environment.

C.He is afraid of nothing.

D.He is interested in old buildings.

2.What made Ye Tian fail to enter the entrance first?

A.The fence. B.The gatekeeper.

C.The dog. D.The bag.

3.Why are the urbe explorers keen on visiting the abandoned structures?

A.Because they can do all the research.

B.Because they can move from one country to another.

C.Because they can visit different kinds of places.

D.Because they can know the history of the city.

4.As an urbex explorer, what characteristic is probably most necessary?

A.Hesitation. B.Thoughtfulness.

C.Determination. D.Inspiration.