
【名词&注释】
氢氧化钠(sodium hydroxide)、形容词(adjective)、钠离子(sodium ion)、清洁剂(detergent)、最高级(supreme grade)、一般现在时(simple present tense)、发明者、造纸术(papermaking technique)、硫酸铜溶液(copper sulfate solution)、名词所有格(possessive case)
[单选题]35_______.
A. happiness
B. unhappy
C. happy
D. happily
查看答案&解析
举一反三:
[单选题]2. Papermaking is_________ of ancient China.
A. one of greatest inventor
B. one of the greatest inventors
C. one of greatest invention
D. one of the greatest inventions
[单选题]12. ________mothers both work in the same hospital.
A. Tim and Peter-s
B. Tim's and Peter
C. Tim's and Peter's
D. Tim and Peter
[单选题]下列说法正确的是
A. 钠离子的电子数多于钠原子的电子数
B. 氢氧化钠能去除油污,可直接用做厨房的清洁剂
C. 把100g12%的硫酸配制成6%的硫酸,需加水100g
D. 100g16%硫酸铜溶液(copper sulfate solution)与100g8%的氢氧化钠溶液反应,所得溶液质量为200g
[单选题]6. If it ________tomorrow,l'Il stay at home.
A. rain
B. rains
C. is raining
D. will rain
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