单项选择题

A．New teachers.
B．New students.
C．Married students.
D．An interviewer.
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单项选择题
A．A teacher of economics.B．A professor of studying happiness.C．A consultant on economic affairs.D．A specialist in political science.
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
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.
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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