血栓闭塞性脉管炎常并发：
A．有脓B．无脓C．脓已成熟D．脓浅E．脓深
参考答案：C
— It was 3 o'clock _______we arrived at the village.
— Oh, it was also at 3 o'clock ______we arrived at the village.
[ ]
A. when; when
B. that; when
C. that; that
D. when; that
血中具有生理作用的钙是（）。
A．草酸钙
B．磷酸氢钙
C．羟磷灰石
D．氢氧化钙
E．离子钙
