均布荷载q作用下简支梁的中点位移为（）。
A.A
B.B
C.C
D.D
参考答案：A
解析：
Mp图、Mi图分别见下图(a)、(b)。
Although punctual himself, the professor was quite used _____ late for his lecture.
A．to have students
B．for students' being
C．for students to be
D．to students' being
