A．how learnedB．how to learnC．to how learnD．how learning
A. how learned
B. how to learn
C. to how learn
D. how learning
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This passage is primarily concerned with______.
A. the change of people's attitude toward their college education
B. the benefits of a college education
C. the result of formal and informal learning
D. the intercommunication among college students
A．Farm workers.B．White-collar workers.C．Blue-collar workers.D．Not mentioned.
A. Farm workers.
B. White-collar workers.
C. Blue-collar workers.
D. Not mentioned.
Rapid economic development has resulted in all the following EXCEPT______.
A. an increasing number of taxi passengers
B. the wide use of labour-saving devices
C. an increasing fast pace of life
D. people's awareness of the importance of exercise
男性，30岁。诉右上颌后牙出现反复肿痛1个月余，右颊部肿胀1周。口腔检查：右上残冠，叩诊(～++)，松动Ⅰ°。X线片示：根尖阴影。右颊部红肿，触痛明显，有波动感。诊断为牙源性颊间隙脓肿，口内切开引流时切口设计应为
A. 在颊部下前庭沟之上做牙槽骨平行切口
B. 腮腺导管口之下做垂直切口
C. 在颊部上前庭沟之下做水平切口
D. 在下前庭沟之上做垂直切口
E. 在上前庭沟之下做垂直切口
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