公安部90号令是指（）规定。
A.机动车登记规定
B.警车管理规定
C.临时入境机动车和驾驶人管理规定
D.机动车登记工作规范
参考答案：C
The computer was used in teaching. As a result, not only _______, but students became more interested
in the lessons. [ ]
A. saved was teachers' energy
B. was teachers' energy saved
C. teachers' energy was saved
D. was saved teachers' energy
关于孕激素的说法，正确的有：（）
A．孕激素属于类固醇激素
B．也属于蛋白激素
C．非孕时主要由卵巢分泌
D．通过正负反馈影响丘脑功能
E．促进水、钠排出
