—— I’m afraid that I can’t finish the task as soon as planned. —— ____. A. Don’t be afraid. B. Don’t mention it. C. I suppose so. D. T
“五十六个民族五十六枝花……”，在中华民族大家庭中，哪个民族是在元朝时才融合形成的新民族？（ ） A．维吾尔族 B．
He put _____ dictionary he bought yesterday on _____ desk and went out of the classroom. A.a; the B. a; a C. the; a
三室式电渗析法处理含Na2SO4废水的原理如图所示,采用惰性电极,ab、cd均为离子交换膜,在直流电场的作用下,两膜中间的Na+和SO42−可通过离子交换膜,而两
下面是有氧呼吸过程图解，请据图完成有关问题： （1）图中A、D所代表的物质分别是__________和__________。 （2）在有氧呼吸过程中的第_________阶
Mr. Smith lived in a small village. He grew vegetables. Years ago he found work in a big city and moved there with his family. On the first Saturday in their new home, Mr. Smith took his new car out o
金属活动性的强弱与人类开发利用这些金属单质的时间顺序有着某种内在联系。由此推断，下列金属中人类开发利用最晚的是：（ ） A．Cu
物理知识与人们的衣食住行相关，以下说法正确的是（ ）A． 超导材料可应用于制作电饭锅的电热丝B． 晾衣服要放在通风处是为了加快水分的蒸发C．
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