“一战”后，在帝国主义召开的一次分赃会议上，规定德国的海外殖民地由英、法、日 等国瓜分，取消义务兵役制，陆军总数不得超过 10 万人的条约是(     )

①唾液淀粉酶从细胞释放到口腔不穿过生物膜

②唾液淀粉酶被吞咽入胃依然能消化淀粉分解

③唾液淀粉酶的空间结构与其功能密切相关

④双缩脲试剂A液与B液等体积混合后与其反应呈紫色．

The sports centre

    The sports centre (中心) is open from next week and it' s only $20 a year.

    There are some soccer teams — one for girls and two for boys.

    There is also a basketball team for boys.

    There are six tennis courts (球场). They are free on weekdays, but it is $2 an hour on the weekend. Every year there are three tennis games. The first is next week.

    On weekdays the swimming pool (游泳池) is open from 7:00 to 18:00, but it is closed(关闭) at lunchtime (12:00~14~00). On the weekend, it is open all day. It is closed in the summer holidays.

2IO₃^﹣+5SO₃^2﹣+2H⁺═I₂+5SO₄^2﹣+H₂O，生成的碘可以用淀粉溶液检验，根据反应溶液出现蓝色所需的时间来衡量该反应的速率，某同学设计实验如表所示：