单项选择题


Questions 24 and 25 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now, listen to the news.
What is NOT described as the economic trouble that traps Zimbabwe

A．Inflation.
B．Food shortages.
C．Falling consumption.
D．High unemployment.
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单项选择题
As to the experiments taken at the Mayo Clinic, which of the following statements is true
A．Each volunteer took the same amount of food with about 1000 calories.
B．Volunteers had to wear special devices to record their weight.
C．It turned out that those who had more walking up and down stairs gained much less weight than others.
D．In the experiment every volunteer gained weight.
单项选择题
What is one of the sources of the oceanic salinity
A．Erosion of rock mantle.
B．Volcanic eruption near coastal area.
C．Dead bodies of marine life.
D．Evaporation of rain water.
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