读“田纳西河流域的综合开发与治理示意图”，回答下列小题。
该河流开发的核心环节是（）
A.发电
B.防洪
C.养殖
D.梯级开发
参考答案：D
解释下列词语。
①忽闪：_____________________________________
②涟漪：_____________________________________
③粼粼：_____________________________________
④花蕾：_____________________________________
⑤吝啬：_____________________________________
⑥和煦：_____________________________________
— How was your holiday?
— It couldn’t have been _____. I just stayed in the hotel because it was raining most of the time.
A．boring
B．more boring
C．most boring
D．less boring
