单项选择题

A．preserved
B．insisted
C．persisted
D．extended
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单项选择题
What does the woman do
A．A teacher of economics.
B．A professor of studying happiness.
C．A consultant on economic affairs.
D．A specialist in political science.
单项选择题
What is the purpose of analyzing the speed of sound through the Pacific Ocean
A．To determine whether the Earth’s temperature is going up.
B．To study the behavior of some sea animals.
C．To measure the depth of the ocean.
D．To measure the movement of the ocean.
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