单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．The application should be put in the post office.
B．The woman should buy a copy machine.
C．The photocopy machine isn’t available anywhere.
D．The woman can make copies at the post office.
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单项选择题
A．variousB．varietyC．variationD．vary
A．various
B．variety
C．variation
D．vary
单项选择题
Which of the following is true within an atom according to the passage
A．The charges of protons equal the charges of electrons.
B．The charges of neutrons equal the sum of the charges of electrons and protons.
C．The charges of protons equal the sum of the charges of electrons and neutrons.
D．The charges of electrons equal the sum of the charges of protons and neutrons.
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