I’m told that languagepractising.com is a free website _____ learners can not just learn various languages but also chat online. A. where B. which C. tha
All the factories________ great importance to the car exhibition, and the price was very low, so a lot of cars were sold during it. A. attached B. afforded C. earned D. brough
甲、乙两地相距s千米，汽车从甲地匀速行驶到乙地，速度不得超过c千米／时，已知汽车每小时的运输成本(以元为单位)由可变部分和固定部分组成：可
单项式的系数和次数分别是 （ ）A、－π，5B、－1，6 C、－3π，6 D、－3，7
复数z＝(i为虚数单位)的共轭复数z是( ) A．1－i B．1＋i C.＋i D.－i
下列离子方程式书写正确的是 A．铝与苛性钠溶液反应：2Al+2OH-+6H2O==2 [Al(OH)4]-+3H2↑B．向明矾溶液中加入少量的氢氧化钡：Al3++2SO42-+4OH-+2Ba2+==2BaSO4↓+ [Al
请用直线 将相关的叙述联系起来。 食道 吸收部分水，无机盐和酒精 胃
池塘中，鲢鱼在上层，鳙鱼居中上层，乌鱼在底层。这反映了 A.种群密度 B.种群特征 C.群落结构 D.生态系统的成分
