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【单选题】
下列物质中含有非极性键的分子是（ ）A.
MgF 2
B.
N 2
C.
CO 2
D.
Na 2 O 2
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举一反三
【单选题】Which paragraph describes how a boy studies?
A.
Paragraph A
B.
Paragraph B
C.
Paragraph C
D.
Paragraph D
【简答题】How do you understand the first sentence in the second paragraph?
【多选题】How is a paragraph expanded into an essay?
A.
The topic sentence of the paragraph becomes the thesis statement of the essay.
B.
The supporting sentences of the original paragraph expand into three separate body paragraphs in the essay.
C.
The concluding sentence is made into a concluding paragraph.
【简答题】红字更正法是在错误的文字或数字上划一红线注销，然后在其上端用蓝字填写正确的文字或数字，并由记账人员盖章，以明确责任。( )
【简答题】红字更正法是在错误的文字或数字上划一红线注销，然后在其上端用蓝字填写正确的文字或数字，并由记账人员盖章，以明确责任。（ ）
【单选题】The third paragraph is concerned with ______.
A.
how clouds rise in the air
B.
how rain is formed
C.
why water-vapor can float in the air
D.
how clouds cause rain
【简答题】红字更正法是在错误的文字或数字上划一红线注销，然后在其上端用蓝字填写正确的文字或数字，并由记账人员盖章，以明确责任。（ ）
【简答题】How does the paragraph express the main points of that school?
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