A：某无色溶液中：Al3＋、Cu2＋、SO42－、Cl－
B：由水电离的c(H+) = 1×10-12 mol·L-1的溶液中：Ba2+、K+、Cl－、NO3－
C：c(OH－)/ c(H＋)＝1012的溶液中：Na＋、Mg2+、NO3－、Cl－
D：加入铝单质能放出氢气的溶液中：Mg2+、NH4+、Cl－、K+
⑴What do you want to buy? ____ A. I see some buses and cars.
⑵What are the children doing?____ B. I want to buy a panda.
⑶What do you see on the street?____ C. Yes, she does.
⑷What colour is this table?____ D. They are reading books.
⑸Does she take a picture?____ E. It is brown.
当你的同学在校园内踢足球时，不小心跌倒而可能发生骨折，下列做法最不可取的是
缫丝时有一道工序是将蚕茧用热水浸泡后缫丝，在蚕茧内死亡的是家蚕的（ ）
