倾斜视线法测设坡度时，使用（）。
A.水准仪
B.平板仪
C.经纬仪
D.钢尺
参考答案：C
数列{an}、{bn}是等比数列，则数列{an+bn}是（ ）
A．等比数列
B．等差数列
C．既是等比数列，又是等差数列
D．不能确定
—Where did you get to know her?
—It was on the farm ___ ___ we worked.
A．that
B．there
C．which
D．where
