2. If $\alpha \neq \frac{k \pi}{2}(k \in \mathbf{Z}), T=\frac{\sin \alpha+\tan \alpha}{\cos \alpha+\cot \alpha}$, then $(\quad)$.
A. $T$ is negative
B. $T$ is positive
C. $T$ is non-negative
D. The sign of $T$ is uncertain
2. B. $T=\frac{\sin \alpha+\tan \alpha}{\cos \alpha+\cot \alpha}=\frac{\sin ^{2} \alpha(1+\cos \alpha)}{\cos ^{2} \alpha(1+\sin \alpha)}>0$.