52. According to Paragraph 3, which of the following statements is true?
A. Teenagers should spend more time learning to drive.
B. Driving is a skill too complicated for teenagers to learn.
C. Restrictions should be imposed on teenagers applying to take driving lessons.
D. The licensing authorities are partly responsible for teenagers' driving accidents.
查看答案
53.A suggested measure to be taken to reduce teenagers' driving accidents is that.
A. driving in the presence of an adult should be made a rule
B. they should be prohibited from taking on passengers
C. they should not be allowed to drive after 10 pm
D. the licensing system should be improved
54. A graduated license is issued to a driver who.
A. is at least a middle school graduate
B. has learned driving at a driving school
C. gains full driving rights step by step
D. has a driving experience long enough
55. The present situation in about half of the states is that the graduated licensing system .
A. is under discussion
B. is about to be set up
C. has been put into effect
D. has been perfected
金属基底的厚度，非贵金属至少保证（）mm
A. 0.1mm
B. 0.2mm
C. 0.3mm
D. 0.4mm
E. 0.5mm
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