问题
选择题
下列物质中属于酸性氧化物但不溶于水的是[ ]
A.CO2
B.SiO2
C.SO3
D.Fe2O3
答案
答案:B
下列物质中属于酸性氧化物但不溶于水的是[ ]
A.CO2
B.SiO2
C.SO3
D.Fe2O3
答案:B
请用方框中动词的适当形式完成句子。 | |
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Last Wednesday Lily 1._____ from London to Madrid.She 2._____ up at 6:30 in the morning and 3._____ a cup ofcoffee. At 6:50 she 4._____ home and went to the airport.When she 5._____,she parked the car and then went to theairport cafe where she hadbreakfast. Then she wentthrough passport control (护照检查站) and 6._____ for herflight. The plane 7._____ off on time and arrived in Madridtwo hours later. Finally she took a taxi from the airport toher hotel in the centre of Madrid. She 8._____ her lunch at12 o'clock. |