估价当事人是指与估价单位有直接关系的单位和个人，包括估价人员、估价机构和估价委托人。（ ）
参考答案：对
Great changes _____ in our hometown in the past ten years. [ ]
A. have taken place
B. have been taken place
C. were taken place
黄河上游，利用河水修渠灌溉，乙形成有“塞上江南”之称的（ ）
A．宁夏平原
B．河套平原
C．华北平原
D．黄淮海平原
