题目

He is one of those people _______ everyone will find _______ hard to please. A . that; being B . whom; \ C . who; is D . which; to be 答案：B下面说法正确的是（　　） A、等边三角形一定是锐角三角形B、直角三角形只有两条高C、锐角三角形中任意两个角的和一定小于90°