题目内容：

The disease Ebola is spreading in West Africa. The situation frightens both local citizens and travelers.

There is no vaccine or special treatment. It is difficult to stop Ebola from spreading. It moves easily from person to person. The disease strikes its victims through direct contact with the blood or other fluids from the body of an infected person.

The bodies of victims still contain the virus days after they die. Local traditions and burial and funeral customs also make the sickness hard to control. Doctors say it is important to identify an Ebola case early to prevent others from becoming infected. Patients suffer from high body temperature, bleeding and diarrhea(腹泻).

Only a few prevention measures exist. The Centers for Disease Control and Prevention in the U.S. suggest staying away from countries with confirmed Ebola cases. People at increased threat include those working in animal research, health care workers and others caring for patients in the community.

In the past, cases of Ebola have been confirmed in the Republic of the Congo, Côte d'Ivoire, Democratic Republic of the Congo, Gabon, Sudan, and Uganda.

Doctors advise careful protective measures if you must go to an area where Ebola exists.

If Ebola has been identified directly around you, the C.D.C. and W.H.O. strongly suggest wearing protective clothing. Cover your face and hands. Goggles can protect the eyes. Try to remove Ebola germs with cleaners that fight infection.

1.How does the disease Ebola spread?  (No more than 16 words)

2.What makes the sickness hard to control?  (No more than 10 words)

3.What symptoms do the Ebola patients have?  (No more than 7 words)

4.Who are at increased threat according to the passage?  (No more than 17 words)