资源介绍：本文为高二下人教版6月考试试卷。目的是为了检查学生阶段学习效果。

21. China has sent two patrol ships to ______waters near Diaoyu Islands after Japan signed ______ contract（合同） to buy the islands.
A. /; a                                B. the; a                           C. /; the                   D. the; the

22. _____ both sides accept the agreement will a lasting peace be established (建立) in this region.

  A. If only                      B. As long as               C. Unless                  D. Only if