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 成人高等教育 / 常微分方程

  • A、

    充分条件

  • B、

    必要条件

  • C、

    充要条件

  • D、

    非充分非必要条件

  积分
 参考答案:
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  • 题型描述: 阅读理解Jacks is the name of a game that is quite popular with children. To play jacks, you will need a small rubber ball and ten small metal objects called jacks.The rules for this game are not very difficult. To begin, you put the ten jacks on the floor or ground in front of you. Throw the ball up (but not too high), pick up one jack, and then catch the ball. Keep the jack in your hand and then continue to pick up the other jacks one at a time. You lose your turn if you do not catch the ball, you do not pick up a jack, or you drop any jacks from your hand.When you finish all ten jacks, you now try to do the same thing again but with two jacks at one time. This is more difficult of course. You lose your turn if you make any of the other three mistakes or if you do not pick up exactly two jacks each time.1、 To play the game, you will need a rubber band and ten small iron objects. A. F B. T 2、 The rules for playing jacks are quite difficult. A. Y B. F 3、 You have to pick up two jacks each time after you finish the first ten jacks successfully. A. F B. T 4、 Many children like the game very much. A. F B. T 5、 The rules for the game will become more practical after you pick up the first ten jacks. A. F B. T统考英语B
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