Scientists find a new star. They saw it in 2018. The star gives off energy(能量) every 18 minutes. The scientists don’t know why. It might be a neutron star(中子星). The new star is very small and heavy. Energy comes out from it regularly.

This star is different from other stars. Scientists have never found a star like it before. They said that there would be these kinds of stars. But they never found one. They think that this kind of star is not visible. Surprisingly, the new star is very bright. A student found it before scientists saw it in 2018.

This is the only star of this kind. Scientists hope that they can find other similar stars in the future.

1.How many times does the new star give off energy in one hour?

A About 18 times.

B About 20 times.

C About 3 times.

D About 60 times.

解析：选C。C数字计算题。根据第一段“The star gives off energy(能量) every 18 minutes.”可知这颗星体每18分钟释放一次能量，即每小时约释放3次能量，故选C。

2.What does the star look like?

A It is big and heavy.

B It is dark and small.

C It is big and bright.

D It is small and heavy.

解析：选D。D细节理解题。根据第一段“The new star is very small and heavy.”可知，这颗星体又小又重，故选D。

3.The underlined word “visible” probably means _________ in Chinese.

A 罕见的

B 奇怪的

C 可见的

D 隐藏的

解析：选C。C词义猜测题。根据第二段“Surprisingly, the new star is very bright.”可知，这颗新的星体非常明亮。Surprisingly表示转折，推断上文是讲科学家们认为这种星体不明亮，即不容易被看见，由此猜测visible意为“可见的”。故选C。

4.Who first found the new star?

A A boy.

B A student.

C A teacher.

D A scientist.

解析：选B。B推理判断题。根据第一段“They saw it in 2018.”和第二段最后一句“A student found it before scientists saw it in 2018.”可知，一名学生在科学家之前发现了这颗新的星体，即那名学生最先发现这颗星体。故选B。

5.The text probably comes from _________.

A a letter

B a textbook

C a story book

D a science magazine

解析：选D。D推理判断题。根据全文可知，本文着重介绍了一颗新的星体被发现的相关情况，属于科学新发现，故应刊载在科学杂志上。故选D。