单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．The active volcanoes in the Antarctic.
B．The icebergs and volcanoes around the world.
C．How to prevent the eruption of volcanoes.
D．Volcano can protect ice sheet from melting.
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单项选择题
A．Correcting students’ exercises.B．Researching in the laboratory.C．Assisting teaching.D．Grading homework sets.
A．Correcting students’ exercises.
B．Researching in the laboratory.
C．Assisting teaching.
D．Grading homework sets.
单项选择题
A．Because they needed more people to work on the farm.B．Because they thought slavers’ life so miserable.C．Because they wanted to the slavers lead a free life.D．Because their pillar economy asked for more labor forces.
A．Because they needed more people to work on the farm.
B．Because they thought slavers’ life so miserable.
C．Because they wanted to the slavers lead a free life.
D．Because their pillar economy asked for more labor forces.
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