人体机体活力最强的时间是()时。
A.06:00~09:00
B.10:00~11:00
C.13:00~14:00
The manager of the hotel requests that their guests ______ after 11:00 p.m..
A.not to play loud music
B.shouldn't play loud music
C.don't play loud music
D.couldn't play loud music
果树幼树期的根系生长高峰主要受哪个因素的影响而多半出现2 个高峰?()
A.果实发育
B.花芽分化
C.新梢生长
D.营养源