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【简答题】
你认为吸食毒品的危害有哪些?
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Where is the Yoga Center?
A.
The Yoga Center is on Seventh Street.
B.
The Yoga Center is on Seventeenth Street.
C.
The Yoga Center is next to a Chinese restaurant.
【单选题】Where is the Business Center?
A.
In the office, madam.
B.
On the first floor, madam.
C.
It is open now, madam.
D.
It opens at 9:00 o’clock, madam.
【单选题】Three particles of masses m 1 = 1.2kg, m 2 = 2.5kg, and m 3 = 3.4kg form an equilateral triangle (等边三角形) of edge length a = 140cm. Where is the center of mass (x COM , y COM ) of this system?
A.
(100cmm, 150cm)
B.
(83cm, 58cm)
C.
(-83cm, 58cm)
【简答题】基因工程抗体类型包括（）,（）,?（）?,（）等.[每空1分]
【单选题】Where is the center of tulip breeding? _____________
A.
Turkey
B.
Old World
C.
Holland
D.
the United States
【单选题】Where is the center for students life on campus?
A.
Main Quad
B.
Oval
C.
Dormitory
D.
White Plaza
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