把一石块挂在弹簧测力计下，称得重为10N，把它全部浸没在水中，弹簧测力计的示数是6N．求：
在“中学生综合素质评价”的平台上，打开小明的综合素质评价，有如下内容，你认为他应该继续保持和发扬的是（ ）
①家长评价：独立意识强、积极向上 ②自我评价：出类拔萃，十全十美
③同学评价：热情大方、活泼开朗 ④老师评价：尊敬师长、阳光健康
________my mother is very tired after a whole day's hard work, she tries to spare time for me.
——Would you like tea or coffee?——________ ,thanks. It's hard for me to fall asleep at night after drinking them.
