遗精是一种生理现象,是男孩迈入青春发育期后的一种自然生理现象,也是男性生殖腺开始成熟的标志,不必产生心理上的紧张或羞涩感。
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He had his book () at his own expense.
A. print
B. printed
C. to print
D. printing
The weather was good except for an () shower.
A. optional
B. intentional
C. additional
D. occasional
战略管理只是高层管理的责任,与中层和基层没有关系。()
A. 正确
B. 错误