读短文并按要求完成相应任务
    Today was the first day of the summer holiday．My friends and I went out together．We went swimming in the swimming pool．We swam for an hour．I did not swim well，but I enjoyed it very much．We had lunch in a fast—food restaurant．I had a sandwich and some orange juice．Alice had a hamburger．Jack had a lot of French fries and some cola．We went shopping in a supermarket．I bought a pink dress．Alice bought a pretty hat．Jack did not buy anything．
    We went home at 3 o'clock in the afternoon．We 、were tired，but we were happy．

如果x²﹣（m+1）x+1是完全平方式，则m的值为（　　）

 

将下列句子改为陈述句

①这样的松鼠能不让人喜爱吗？

②这位小姑娘天真美好的心灵，不正像一朵含苞欲放的花蕾吗？

右图是甲和乙两种物质的溶解度曲线。下列说法正确的是（   ）

在1687年出版的《自然哲学的数学原理》中，牛顿曾设想在高山上水平抛出物体，若速度一次比一次大，落点就一次比一次远．当速度足够大时，物体就不会落回地面而成为人造卫星了，这个足够大的速度至少为____；物理学家建立了狭义相对论，发现了万有引力定律，测出了引力常量G的值．