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甲肝疫苗也可以预防乙肝

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Today’s college students are surrounded with astonishing resources, ranging from fascinating fellow students, a ______ and caring faculty to a magnificent library and well-equipped residential communities. (learn)

“不”字单用或在词句末尾以及在阴平、阳平、上声、前念本调（）

Payless took a hit during the global recession in 2008, but its sales were much better than other retailers.

[Al（H2O)6]3+的共轭碱是答案： [Al（H2O)5（OH)]2+