If you don’t know the name of the person you are writing to, how will address him/her in an email（）
A. Dear
B. Hi
C. To whom it may concern
Dear Sir or Madam
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Imagine you are writing a very formal email to external readers you don’t know well. Which of the following can be used for closing（）
A. Sincerely
B. See you tomorrow
Cheers
D. Respectfully yours
It can be inferred from the pyramid of learning that____（）
A. lectureisoneofthemostineffectivemethodsforlearningandretaining information
B. students have different learning styles
C. intelligence is fixed at birth
D. praising effort is a much better way to motivate people to work hard and keep improving
The signals and clues provided by lectures will enable students to__（）
A. stay focused and avoid distractions
B. understand the lecturer’s stance
C. identify the key points
D. improve the listening skill
酸雨的主要前体物质是（）
A. CO2B:O3
B. C．CO
C. D．SO2
D. E．PAH
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