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
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酸雨的主要前体物质是（）
A. CO2B:O3
B. C．CO
C. D．SO2
D. E．PAH
Which is NOT the meaning of the word“independent”（）
A. Not relying on
B. autonomous
C. self-directed
D. self-controlled
The common types of reading assignment in the university include______（）
A. required reading
B. extracurricular reading
C. recommended reading
D. proofreading
The floor attendant steps forward（）the guests
A. welcoming
B. welcome
C. to welcome
D. to welcoming
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