Question

【题目】It's good manners to be ________ while watching the raising of our national flag.
A.happy
B.serious
C.kind
D.generous

Answer 1

【答案】B
【解析】句意：在观看升国旗的仪式时表情严肃是良好的行为习惯。A. happy高兴的；B. serious严肃的C. kind和蔼的；D. generous慷慨的。结合句意，答案为B。