在机舱内，一般使用什么膨胀率（倍数）的泡沫灭火系统？
A、低膨胀率
B、中膨胀率
C、高膨胀率
D、以上均可
参考答案：C
A. old B. young
A. tall B. short
根据句意及首字母提示完成单词。
1. C______ is the biggest and the most important festival in the west on December 25.
2. The books are for the a ______. The children can't read them.
3. N______ the temperature of our body is 37℃.
4. She likes g______ better than apples.
5. People eat rice dumplings to r______ Qu Yuan.
He is ______________.
She is ______________.
She is a ______________ woman, and he is a ______________ man.