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公路交通路网发达，交通工具种类丰富，交通成本可能高于铁路但低于航空。

A．对
B．错
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单项选择题
In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、Because she can concentrate on other finals.
B、Because she wants to go to the football match after the test.
C、Because she plans to go to the new nightspot downtown.
D、Because she can concentrate on a paper for another class after the test.
单项选择题
For a normal business letter format, some people prefer to use “Regards, Sincerely, and Sincerely yours”. This part is called ________. 
A、complimentary close
B、signature
C、letter head
D、letter body
多项选择题
公路自然区划中，一级区划是将全国划分（   ）地带。
A、多年冻土
B、季节冻土
C、临时冻土
D、全年不冻土
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