社会公德的重要性在于      （  ）

①关系每个人的切身利益

②它是社会成员的共同心愿、共同需要

③它的水平高低直接影响社会秩序的好坏

④它的水平高低直接影响社会环境的好坏

    Tom ____ up at 6:30 every morning and he ____ to school at 7:40. He ____ math at 8:30 and science at 9:30. English is his ____ subject. He ____ it because it's really ____. Mr. Green is his math teacher. He has ____ at 12:00 at school. His music and P.E. classes are often in the afternoon. They are ____. But he ____ not like history, because it's ____. He has seven classes on Monday, Tuesday and Thursday. He has six classes on Wednesday and Friday.

新疆地区的瓜果特别甜，这是因为新疆地区夏天白昼长，气温较高，____ 作用旺盛，制造有机物____ （填“多”或“少”）；夜间短，气温较____ ，____ 作用弱，消耗有机物较____ ，这样有利于植物体内有机物的积累。

设函数$f\left(x\right)=\left\{\begin{array}{c}{2}^x,x<0\\ g\left(x\right),x>0\end{array}\right.$若$f\left(x\right)$是奇函数，则g(2)的值是（   ）