Mr. Black: __________
Mike: Very well, thank you.
A:What's your name?
B:How are you?
C:I have a book.
D:Good morning.
除去下列物质中的少量杂质,所选试剂及操作都正确的是( )
物质
杂质
试剂
操作
A
FeCl2溶液
CuCl2
过量铁粉
结晶
B
CO2
H2O
氢氧化钠
干燥
C
NaCl溶液
Na2SO4
适量Ba(NO3)2溶液
过滤
D
铜粉
CuO
过量稀盐酸
⑴This is a photo of Hainan. ____
⑵I got to school by car yesterday.____
⑶Beijing is in the north of China.____
⑷The mountains are really beautiful.____
⑸I went to England last year.____
不少人都有这样的经历:当悲伤、抑郁时,会出现头疼、胃痛、失眠、血压增高等症状。最近,美国俄亥俄州立大学的研究人员发现,如果常年处于慢性压抑之下,会使血液中葡萄糖和脂肪酸升高,患糖尿病和心脏病的风险加大。另外,压力还会使人体胆固醇水平上升,更易诱发心血管病。这告诉我们( )