
【名词&注释】
氧化铝(alumina)、二氧化氮、硫酸铜(copper sulfate)、氢氧化铁(ferric hydroxide)、酒精灯(spirit lamp)、三氧化硫(sulfur trioxide)、稀释浓硫酸、要注意(should be noticed)
[单选题]43__________.
A. watch
B. notice
C. look
D. hear
查看答案&解析
举一反三:
[单选题]Our teacher told us the sun ____ in the east .
A. rise
B. rose
C. rising
D. rises
[单选题]从物质的分类的角度看,下列物质与二氧化氮、三氧化硫(sulfur trioxide)、氧化铝属于同类别的物质
A. 氢氧化铁
B. 硫酸铜
C. 水
D. 硝酸
[单选题]2. My mother likes eggs and salad _________ breakfast.
A. at
B. for
C. to
D. of
[单选题]1.I don't have a partner __________volleyball __________.
A. to practice;/
B. practice; with
C. to practice; with
D. practice;/
[单选题]45.
A. day
B. night
C. morning
D. afternoon
[单选题]实验过程中要注意(should be noticed)安全,下列实验操作中安全的是
A. 将鼻孔凑到容器口去闻药品的气味
B. 稀释浓硫酸时,将浓硫酸慢慢注入盛水的量筒内
C. 点燃一氧化碳前先检验其纯度
D. 为了节约火柴,可用燃着的酒精灯点燃另一盏酒精灯
[单选题]16.
A. with
B. for
C. of
D. in
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