明代著名藏书家朱学勤的藏书楼叫（）。
A.传经堂
B.结一庐
C.栖溪讲舍
参考答案：B
正常足月妊娠脐带的平均长度是
A．50cm
B．60cm
C．70cm
D．40cm
E．45cm
Let's vote _____ Betty, because she often helps people _____ need.[ ]
A. to; in
B. to;to
C. for; in
D. for; to
