水圈的特点是( )
A:连续而规则的圈层
B:不连续不规则的圈层
C:不连续而规则的圈层
D:连续而不规则的圈层
小周在日记里写道:“放学时,铃声是悦耳的;考试时,铃声是紧张的;思考时,铃声是刺耳的。”这说明( )
已知平面区域如右图所示,z=mx+y(m>0)在平面区域内取得最大值的最优解有无数多个,则m的值为 ( )
补全表格中所缺信息。
Cathy's problem
◎She feels sad because she has____every day.
ZhangMei's advice
◎Talk to others,such as parents,____or friends.
◎Listen to music because music can make people feel____.
◎____.It's a good way to forget about homework.
◎Try to____classmates.