单项选择题

Which of the following is believed to be the cause of the La Nina phenomenon

A．Heavy rain.
B．Flooding.
C．Cooling of Pacific Ocean waters.
D．Warming of Pacific Ocean waters.
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单项选择题
The landslide has claimed ______ lives on a southern island.
A．three
B．four
C．seven
D．ten
单项选择题
What was the purpose of U.S. first lady's visit
A．To promote mutual trust between the U.S. and the Islamic countries.
B．To strengthen the trading partnership between the U. S. and the Islamic countries.
C．To speculate on her future plan.
D．To obtain more political support.
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