输电线路杆塔的基础，其作用是防止杆塔因受重力，风力及（）时，单向拉力而下压、上拔和倾倒。

A.洪水

B.断线

C.地震

D.泥石流

—Do you know _____ university student who is talking with Joe?

—Yes, she's my cousin, Kate. [ ]

A. a

B. an

C. the

D. /