喷射性呕吐伴眩晕应考虑
A．急性胃炎B．前庭功能障碍C．流行性脑脊髓膜炎D．流行性乙型脑炎E．脑出血
参考答案：B
I recommended ________ an English-Chinese dictionary, which I thought would be of great help to his studies.
A．him buy
B．he bought
C．to buy
D．buying
黄铁矿氧化后形成（），硬石膏吸水后转变为（）。
A、磁铁矿、石膏
B、磁铁矿、滑石
C、褐铁矿、石膏
D、褐铁矿、滑石
