An American doctor was flown back to the US to be treated for Ebola(埃博拉) last year and declared free of the virus. But he was found to have Ebola disease in his eyeball later.  

Dr Crozier said he had a serious pain in his left eye and poor vision about two months after he left hospital in October. His eye even began to lose its blue colour and turned bright green.

After a number of tests, doctors were shocked when they put a needle in his eye and removed some fluid, which was tested to have Ebola virus. Luckily, it was not serious, and Dr Crozier was in good treatment. Over the next few months Dr Crozier's vision returned and his left eye turned blue again.

He got the disease while working in Sierra Leone（塞拉利昂）, and was terribly ill when he was sent to Emory Hospital in Atlanta, Georgia in September.

Ebola is already also known to live in semen months after it has gone from the blood. More than 10,000 people have died of Ebola, mainly in West Africa.

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1.How did Dr Crozier go back to the US?

A He went back to the US by ship.

B He went back to the US by air.

C He went back to the US by train.

D He went back to the US on foot.

解析：选B。B细节理解题。根据第1段第1句An American doctor was flown back to the US…可知，故选B。

2.Where did doctors find Ebola virus again on Dr Crozier?

A In his eyeball.

B In his blood.

C In his semen.

D In his ear.

解析：选A。A 细节理解题。根据第3段第1句After a number of tests, doctors were shocked when they put a needle in his eye and removed some fluid, which was tested to have Ebola virus.可知，故选A。

3.Which did NOT happen to Dr Crozier when Ebola virus was tested in his eyeball?

A A pain in his left eye.

B poor vision.

C green eyeball.

D blue eyeball.

解析：选D。D 内容理解题。根据第2段表述可知，故选D。

4.Which statement is RIGHT according to the passage?

A Which statement is RIGHT according to the passage?

B Ebola disease is easily cured.

C Ebola virus only lives in blood.

D A large number of people died of Ebola in West Africa.

解析：选D。D内容理解题。根据文章最后一句More than 10,000 people have died of Ebola, mainly in West Africa.可知，故选D。