单项选择题

Conversation Two

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A. To inquire about switching majors.
B. To find a helping supervisor.
C. To make up the remaining credits.
D. To apply for a master’s degree.

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单项选择题
What was physicist Russel Seitz’s suggestion to cool the planet’()

A. Arranging the warm currents in a more focused way.
B. Whitening the surface of lands to reflect more sunlight.
C. Generating tiny bubbles with fleets of customised boats.
D. Producing chilly winds to cool the water to freezing point.

单项选择题
A. The plane flies at high altitudes. B. The plane is filled with air.C. The metal structure of the plane is very strong.D. A small part of the plane cracks.
A. The plane flies at high altitudes.
B. The plane is filled with air.
C. The metal structure of the plane is very strong.
D. A small part of the plane cracks.
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