7. As shown in Figure 1, the line $l_{1}: y=x+1$ and the line $l_{2}: y=-x-\frac{1}{2}$ divide the Cartesian coordinate plane into four parts. Then the point $\left(-\frac{4}{5}, \frac{4}{7}\right)$ is in ( ).
(A) the first part
(B) the second part
(C) the third part
(D) the fourth part
$$
\begin{array}{l}
\text { 7.B. } \\
\text { Since }\left(-\frac{4}{5}\right)+1=\frac{1}{5}<\frac{4}{7}, \text { and } \\
-\left(-\frac{4}{5}\right)-\frac{1}{2}=\frac{3}{10}<\frac{4}{7},
\end{array}
$$

Therefore, the point $\left(-\frac{4}{5}, \frac{4}{7}\right)$ is above $l_{1}$ and $l_{2}$, i.e., in the second region.