玻璃板水位表的背面有三角形沟槽是为了（）。
A.加强刚度
B.美观
C.光的折射
参考答案：C
用竖式计算并验算．
208×43=
986÷49=
--- Would you like to go for a picnic to enjoy the fresh air outside this weekend?
--- __________. It will be a rainy day.
A．I’d love to
B．I’m afraid not
C．I hope to
D．I think so
