H型钢桩的堆放层数不宜大于（）层。（）
A.3
B.4
C.5
D.6
参考答案：D
煎煮中药一般用水量宜高出药面（）
A.2～3cm
B.3～5cm
C.4～6cm
D.5～6cm
E.6～8cm
—How do you like the story?
—Interesting, _______ the end of it is not perfect. [ ]
A. so
B. though
C. or
D. because
