题目

Nowadays, shopping online becomes a new way of shopping. It is getting more and more popular. Many people like doing some shopping through the Internet.Why is shopping online becoming more and more popular? First, it provides lots of advantages. There are many goods(商品)on the Internet. People can find anything they want.The price on the Internet is usually lower than that in the store. People can save some money.Second, more and more people have their own computers and they join their computers with the Internet. So it is possible for many of them to do shopping through the Internet. P15、甲、乙两车间排放出的污水中分别含有大量且不同的4种离子,这些离子是Ag+、Ba2+、Fe3+、Na+、Cl-、NO3-、OH-、SO42-.经检测,甲车间的污水PH>7,则下列判断正确的是(  )A、甲车间的污水中可能含有Ba2+B、乙车间的污水中可能含有Na+C、甲车间的污水中不可能含有SO42-D、乙车间的污水中一定含有Fe3+
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