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
A．Military aid.B．Social security.C．Economic recovery.D．Democratic system.
A．Military aid.
B．Social security.
C．Economic recovery.
D．Democratic system.
单项选择题
What is a diversified portfolio of investments according to Mr. Boros
A．A wide selection of investments.
B．A limited range of growth stocks.
C．A group of low risk bonds and cash.
D．A group of high risk mutual funds.
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