The charts sold are of （）.
A. newly edition with up to date correction and in reasonable prices
B. the current edition and incorporate the last Notices to Mariners correction
C. the current edition and incorporate the latest Notices to Mariners correction at the time of sale
D. brand-new one with up to date correction and clean writing
The working cycle of a four-stroke diesel engine consists of four events:（） (1) compression (2) expansion (3) exhaust (4) suctionThe correct sequence is
A. (4)-(2)-(3)-(1)
B. (4)-(3)-(1)-(2)
C. (4)-(3)-(2)-(1)
D. (4)-(1)-(2)-(3)
没有（）的提升，就很难有教育质量的提高；没有教师的主动发展，就很难有学生的主动发展；没有教师的（），就很难有学生的创造精神。
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