“放弃了自己对社会的责任，就意味着放弃了自身在这个社会中更好生存的机会”，这表明一个人所担负的责任往往是多重的。（  ）

在数$\frac{4}{3}$，﹣1，0，π，﹣4$\frac{1}{2}$，﹣0.02中，

①正数____ ； ②负数____ ；③整数____ ；④分数____ .

在“研究匀变速直线运动”的实验中，打点计时器使用的交流电源的频率为50Hz，记录小车运动的纸带如图所示，在纸带上选择5个计数点O、A、B、C、D，各点到O点的距离如图所示．

根据学过的知识可以求出小车在B点的速度v_B为____ m/s；BD间的平均速度为____ m/s；小车运动的加速度为____ m/s²（结果均保留二位有效数字）

    Do you know 2022World Cup will be held in Qatar（卡塔尔）．And FIFA（国际足联） has made a big decision．The 2022Qatar World Cup will be held in November and December．It is the first time FIFA has moved the event from its traditional summer to winter．

    According to the decision，the 2022World Cup will start on November 21．The final will take place on December18，one week ahead of Christmas．The tournament will last 28days，half a week shorter than usual．

    FIFA said，"This is an important step for us．December18，2022is a Sunday，and it's National Day in Qatar，so it fits perfectly．"

    Many people disagree that Qatar has the chance to held the 2022World Cup，since summer temperatures is very high﹣sometimes，the temperature may be about 50℃．So the country has an idea to move it to winter．At last FIFA gave the chance to Qatar．

    Although the change is good for the players，there is still much opposition．The biggest opposition comes from the major European leagues（欧洲联赛），because the new time will be just Europe's club season．FIFA said they will try their best to make things go well．

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