Zimbabwe are poor. The last El Nino was in 1991 to 1993. That was when southeastern Africa suffered a serious lack of rain.

　　The scientists wrote about their recent work in the publication Nature. Their computer program can tell when an El Nino will develop up to a year before it does. They suggest that this could provide an effective early warning system for southern Africa, and could prevent many people from starving.

　　34. El Nino is known as _______.

　　A. the changing of the weather in southern Africa

　　B. the weather which brings drought（旱灾）to Africa

　　C. the warming of waters in the Pacific Ocean

　　D. the weather phenomenon that brings heavy rains to Africa

　　35. Scientists study El Nino in order that ______.

　　A. they can put all this information into their computers.

　　B. they can tell why Zimbabwe has little or no rain

　　C. they can do some research work in this field.

　　D. they can provide a kind of early warning to the place that will suffer from drought

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

　　A. Scientists come to understand how El Nino appears.

　　B. Three scientists from the USA work on this subject.

　　C. El Nino has something to do with Zimbabwe’s poor crops.

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