只用一种试剂可以区别Na2SO4、MgCl2、FeCl2、Al2(SO4)3、CuSO4五种溶液,这种试剂是( ) A . 氨水 B . NaOH溶液 C . 硫酸 D . NaNO3溶液 答案:B
—I feel stressed out from time to time. Could you give me some advice? — listen to music and sleep early? A. How about B. Would you like C. Why don’t you D. Why don’t