I'm playing basketball with my friend now.
He is helping his mom do the housework.
She is gong to school .
They are drinking water now .
Listen!She is singing.
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- 1有这样的物理现象：在透明玻璃杯的杯底放一枚硬币，再放一些水．把杯子端到眼睛的高度，再慢慢下移．当杯子下移到某一位置时，可以看到两枚硬币．请你解释这种现象．
- 2已知f(x)是定义域在R上的奇函数,当x≤0时f(x)=x的平方减2倍的x,求x∈R时f(x)的表达式.
- 3已知函数y=b+(a的x方+2x),a,b是常数且a大于0,a不等于1.在区间[-3/2,0]上有y最大=3最小=5/2,求a,b
- 4在街道的另一边 用英语怎么说
- 5把21－22－23－24－25－26－27－28－29这9个数相加使横行竖行斜行上三个数相加都等于75?
- 6若三角形ABC三边a,b,c满足a的2次方+b的2次方+c的2次方=ab+bc+ca,试问三角形ABC的三边有何关系?
- 7i am reading a book.改为肯定句
- 8计算:1-2+3-4+5-6+...+2007-2008+2009-2010+2011-2012+2013-2014
- 9重新排列字母,组成正确单词
- 10Success is measured not by how much money you have made,but by how many people you have helped.此句中not可否放在is之后呢?