试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
An artificial waterfall thus obtained is usually regulated by a dam.（）
参考答案
正确答案：
试题解析
regulate控制；control控制。
句意：由此获得的人工瀑布通常由大坝控制。