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【简答题】
某实验室的废液中可能含有CuSO 4 、H 2 SO 4 、Na 2 SO 4 、NaCl、NaOH、Na 2 CO 3 和Ba（NO 3 ） 2 中的一种或几种．某同学对其进行如下实验： ①取少许废液观察，为无色透明溶液 ②向所取废液中滴加氯化钡溶液，有白色沉淀产生，再加入过量稀硝酸，无明显现象 ③另取废液少许，向其中加入后，产生大量气泡根据以上现象可推断：废液中肯定含有______，肯定不含______不能确定是否含有______．
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举一反三
【简答题】Why do people sometimes forget their surroundings and even their identity while reading?
【单选题】I'd rather_______ your telephone number in my notebook, _______ I will forget it.
A.
write; or
B.
to write, or
C.
write; however
D.
to write; however
【单选题】—Don’t forget their address and telephone number. —I will _____ in my notebook.
A.
write them down
B.
write it down
C.
write down it
D.
write down them
【单选题】— Do you still remember the lecture by Mr. Smith? — Yes, ________. [ ]
A.
never I shall forget
B.
so do I
C.
never shall I forget
D.
neither shall I forget it
【单选题】When joining a vessel，do not forget personal documents and your spectacles，and ()if necessary.
A.
drug
B.
remedy
C.
medicine
D.
healer
【简答题】A．shouldn't do B．can do sometimes C．should do D．forget
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