植物吸收利用的是（）
A.硫酸盐
B.硫化氢
C.元素硫
D.硫氧化物
参考答案：A
—How was the 2008 Beijing Olympic opening ceremony?
—________ that the whole world was attracted.
A．It was very fantastic
B．Such fantastic was it
C．So fantastic was it
D．So fantastic it was
影响涡轮喷气发动机进气密度的因素是（）.
A.飞行速度
B.增压比
C.涡轮和压气机效率
D.飞行高度和外界温度
