表皮生长因子受体抑制剂相关皮肤不良反应的中位出现时间是（）。
A.1～2周
B.2～3周
C.3～4周
D.4～6周
E.6～8周
参考答案：A
接通冷气开关前，应先将鼓风机开关接通。
I ___________ at school now, but I _________ at home an hour ago.[ ]
A. am, am
B. was, was
C. am, were
D. am, was
