1. [单选题]From the last paragraph we know that in Brazil______.
A. it is important to arrive at the appointed time
B. it is rude for professors to be late for class
C. it is normal for students to leave during lectures
D. it is natural to keep the professor staying after class
2. [单选题]下列选项中，首选的心肺复苏药物是
A. 利多卡因 B.阿托品
B. 麻黄素(ephedrine)
C. 肾上腺素
D. 异丙肾上腺素
