题目

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 We face problems in our everyday life.Don't worry.As long as you are breathing,you can solve problems.Be aware of problem First of all,it is important to know and understand the problem clearly..Following questions like why,what, how,when,where and who will take you to the root cause of the problem.Analyze the problem Analyzing the problem will give you time to think of a proper solution..They can be diagrams（图表）, flowcharts or a lists,etc.Plan a strategy（策略一个人用双手在单杠上把自己吊起来，静止在竖直面内．在下列四种情况中，两臂用力最小的是 [　　] A．当他两臂平行时 B．当他两臂成60°夹角时 C．当他两臂成90°夹角时 D．当他两臂成120°夹角时