造成脑出血病人死亡的最主要原因是（）。
A.脑疝
B.呼吸道感染
C.心力衰竭
D.休克
E.心律紊乱
参考答案：A
据统计，全球每小时约有510 000 000吨污水排入江河湖海，用科学记数法表示为______吨．
I really wonder _______ will stop Japan from its annual whale hunt in the Antarctic. [ ]
A. that it is what
B. what it is that
C. what is it that
D. that is it what
