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Scientists from the World Health Organization (WHO) say the world is possibly at risk from a deadly disease. However, they do not know its name or what it does and looks like.

They have called it “Disease X”. It could be caused by a virus(病毒). The WHO said Disease X could go unnoticed until it is too late and it is quickly spreading around the world. The WHO is taking the threat of Disease X seriously. It is putting a lot of money into research and is preparing a plan for a sudden outbreak.

The scientists said that Disease X could come from many different sources. It could come from existing diseases changing; it could come from terrorism and bio-weapons; it could also come from scientists using DNA-changing technology to make entirely new viruses. The biggest threat could come from animals. The U.S. Centers for Disease Control and Prevention said, "Scientists estimate that more than 6 out of every 10 known infectious diseases in people are spread from animals." Everyone living closer together in cities and increasing international travel and tourism will make it easier for diseases to spread.

1.What is the name of the Disease X disease?

A Flu.

B Risk.

C Virus.

D No one knows.

解析：选D。细节理解题。根据第一段最后一句However, they do not know its name or what it does and looks like.可知他们不知道它的名字，也不知道它是什么样子，故选D。

2.What kind of technology could make totally new viruses?

A Nanotechnology.

B Radar technology.

C Computer technology.

D DNA-changing technology.

解析：选D。细节理解题。根据第三段第二句中it could also come from scientists using DNA-changing technology to make entirely new viruses.可知X病可能来自科学家利用DNA改变技术制造全新病毒，故选D。

3.Which of the following can cause Disease X?

A The Internet.

B Mushrooms.

C Pollution.

D Animals.

解析：选D。细节理解题。根据第三段第三句The biggest threat could come from animals.可知最大的威胁可能来自动物，故选D。

4.How many infectious diseases in humans come from animals?

A 6%.

B 10%.

C 60%.

D 66%.

解析：选C。细节理解题。根据第三段第四句Scientists estimate that more than 6 out of every 10 known infectious diseases in people are spread from animals.可知每10个已知的人类传染病中，就有超过6个是从动物身上传播的，故选C。

5.What is making diseases easier to spread?

A Tourism.

B The Internet.

C Better hospitals.

D Global warming.

解析：选A。细节理解题。根据第三段最后一句Everyone living closer together in cities and increasing international travel and tourism will make it easier for diseases to spread.可知人们在城市中越来越挤的生活以及国际旅游和旅游业的增加将使疾病更容易传播，故选A。