
【名词&注释】
第一次(the first time)、蒸馏水(distilled water)、第一个(first)、澄清石灰水
[单选题]欲鉴别氢气、氧气、二氧化碳、甲烷4种气体,现有一盒火柴,还需要用到下列实验用品中的
A. 装有蒸馏水的烧杯
B. 装有无色酚酞的烧杯
C. 冷而干燥的烧杯
D. 内壁蘸有澄清石灰水的烧杯
查看答案&解析
举一反三:
[单选题]3.—__________ 1 go out for a while?—No,you __________ You must finish your homework first.
A. Must,needn't
B. Can,may
C. May,mustn't
D. May,must
[单选题]18. —What's behind ________door? I can’t open it.—Let me see.Oh,there is ________chair.
A. the;a
B. a;the
C. a;a
D. the,the
[单选题]12.
A. entered
B. left
C. found
D. got
[单选题]____________( )51.
A. have
B. with
C. without
D. in
本文链接:https://www.zhukaozhuanjia.com/download/73933r.html