How _______ your trip to London last vacation? [ ]
A. is
B. was
C. were
答案：B
Can you spare me some paper? Mine ____.
A．has run out
B．has used up
C．has run out of
D．is run out
具有传染性血液的处理方法是：（）
A.高压消毒后焚烧
B.高压消毒后掩埋
C.无破裂的血袋直接焚烧
D.全部直接焚烧
