题目内容
由于影响商品的现货价格与期货价格的因素相同，使套期保值基差的波动幅度相对较小且稳定在某一固定的波动区间中，所以套期保值总是有效的。（）
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设计任务：请阅读下面学生信息和语言素材，设计一个35分钟的语法教学活动。
教案没有固定格式，但须包含下列要点：
teaching objectives
teaching contents
key and difficult points
major steps and time allocation
activities and justifications
教学时间：35分钟
学生概况：某城镇普通中学高中二年级学生，班级人数40人。多数学生已经达到《普通高中英语课程标准（实验）》六级水平。学生课堂参与积极性一般。
语言素材：
Living Life Over
If I had my life to live over ... I would have talked less and listened more.
I would have invited friends over to dinner even if the carpet was strained and the sofa faded.
I would have taken the time to listen to my grandfather ramble about his youth.
I would never have insisted the car windows be rolled up on a summer day because my hair had just been teased and sprayed.
I would have burned the pink candle sculpted like a rose before it melted in storage.
I would have sat on the lawn with my children and not worried about grass stains.
I would have cried and laughed less while watching television and more while watching life.
I would have gone to bed when I was sick instead of pretending the earth would go into a holding patter if I were not there for the day.
I would never have bought anything just because it was practical， would not show soil or was guaranteed to last a life time.
There would have been more "I love yous" ... more "I‘m sorrys" ... but mostly， given another shots at life， I would seize every minute ... look at it and really see it ... live it ... and never give it back.
AB连线是某电场中的一条电场线，一正电荷从A点处自由释放，电荷仅在电场力作用下沿电场线从A点到B点运动过程中的速度图象如图所示，比较A，B两点电势φ的高低和场强E的大小，下列说法中正确的是（）。
In speaking activities， a speaker often tries to avoid using a difficult word or structure and chooses to use a simpler one. What learning strategy does the speaker use？
Which of the following sounds is a voiced bilabial stop？
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