下列景观图片所对应地理区域最有可能的是 （  ）

根据短文理解，选择正确答案。

    There are fifty students in our class. There are twenty-four boys and twenty-six girls. Some students live near the school, and some others live far from school. About half of the students usually come to school by bike. They often get to school at a quarter to seven. About fifteen students often come to school by bus. They often get to school very early, too. Another ten students come to school on foot. Their homes are near the school, but they are often late for school, because they get up late.

如图所示的四个实例中，目的是为了增大摩擦的是（   ）

若函数y=f(x)是函数$y=a^x(a>0,a\ne 1)$的反函数，且$f\left(4\right)=-2$，则$f\left(x\right)=$（   ）