题目内容：

UFO stands for "unidentified flying object"(不明飞行物). Many people reported having seen UFOs in the sky. A lot of countries tried to research them and in 1952 they got the name of UFO.

There were several reports published in the 19th century which were related (相关的) to UFOs. Denison Daily News in its report of 25th January, 1878 wrote that a farmer, Martin, saw a flying object in the sky and it was just like a plate. This was the first time that the word plate had been related to the UFOs.

The first reports on UFOs came during World War II. In 1947 pilot Kenneth Arnold said while he was flying near the Mount Rainer he saw a very bright object in the sky. He said that it was like a plate too. The information given by Kenneth got lots of attention from the media and people.

Several research organizations gave their reports on the UFOs. They showed direct or indirect physical evidence of the UFOs, and sometimes UFOs’appearance was found on the radar (雷达) screen. Many people tried to take video tapes or photos of the UFOs as proof. Most UFOs are in saucer shape while many UFOs are like a cigarette or a half ball.

Many films and TV shows are made about UFOs. There are two famous movies which are created on the theme of UFOs and aliens, War of the Worldand Star Wars. UFOs have created a new field in science which is known as Ufology (飞碟学).

1.Which of the following is TRUE according to the passage?

A. People named the flying object UFO in the 19th century.

B. The UFOs Martin and Kenneth Arnold saw were in different shapes.

C. Kenneth Arnold was given little attention for his discovering UFO.

D. Martin was the first person that described the flying object as a plate.

2.What does the underlined word "proof" in the fourth paragraph mean?

A. Research.       B. Evidence.

C. Appearance.    D. Mystery.

3.From the passage, we can infer ______.

A. most UFOs’shapes are changeable

B. the danger of UFOs attracted the media’s attention

C. the radar helps people get UFO evidence

D. Ufology was developed a hundred years ago

4.The next paragraph following the passage might talk about ________.

A. different UFOs’shapes

B. famous movies on the UFOs

C. the new science —Ufology

D. the effect of UFOs on humans