下列哪项不是引起呼吸过速的原因（）
A.发热
B.贫血
C.甲亢
D.心衰
E.颅内压增高
参考答案：E
___ it was already dark, they went on working in the fields.
A．If
B．Whether
C．But
D．Though
过渡性贫困
