成人实施胸外心脏按压的部位是（）
A.胸骨上部
B.胸骨中下1/3交界部
C.剑突下
D.胸骨左缘3、4肋间部
E.胸骨中部
参考答案：B
After having breakfast, he ______ to the bus stop this morning. [ ]
A. ran off
B. put off
C. took off
D. turned off
—Oh! I came in a hurry and forgot to bring food.
—It doesn't matter. You can have ________. [ ]
A. we
B. us
C. our
D. ours
