单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．To go shopping.
B．To do research for her story.
C．To meet with her professor.
D．To take a break from her work.
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单项选择题
A．About two million.B．About three million.C．About five million.D．About six million.
A．About two million.
B．About three million.
C．About five million.
D．About six million.
单项选择题
What does our atmosphere do
A．It absorbs the heat from the ground and sends it to the Sun.
B．It absorbs the heat from the Sun and emits it back to the Earth.
C．It absorbs the heat from the Sun and emits it the same way.
D．It absorbs the heat the ground emits and sends some of it back to the Earth.
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