题目

果农手握如图所示的修枝剪刀把手的末端，便可以轻松地剪断树枝．这时修枝剪刀属于杠杆，它的支点在点（选填“A”、“B”、“C”）． 答案：【1】省力【2】BIt really disappointed him _____ he couldn't get a ticket for the concert. [     ]A. for B. if C. becauseD. that