水电资源技术可开发量约5.7亿千瓦，主要集中在南部地区，占82%。
参考答案：错
--Mary, have you got my email? I sent you a birthday card yesterday.
---Oh, really! I haven't ＿＿＿my mailbox yet.
A．seen
B．checked
C．received
D．answered
冷冻的大蒜瓣
