_______ the teacher was very busy, _______he still helped me with my English.
A:Though, but
B:Because, but
C:Though, yet
D:Because, /
小明的妈妈用食用油炸油条时,油的温度约为200℃。她不小心把几滴水溅到了油锅里,出现了“油花四溅”的现象,请解释这个现象。
世界最高和最低处都在亚洲,最低处在( )
(1)计算:2cos30°+3-2--50; (2)解方程5x-4x-2=4x+103x-6-1.