第23题: [单项选择]著名的“响尾蛇”空对空导弹是采用________。 A. 雷达制导系统 B. 红外线制导系统 C. 激光制导系统 D. 机械制导系统 参考答案:B 答案解析:(“响尾蛇”空对空导弹是美国研制的近距离空对空导弹,代号为AIM-9。它是世界上装备数量最多的空对空导弹,采用鸭式气动布局,红外线制导系统。)
第24题: [单项选择]Passage Three Questions 32 to 35 are based on the passage you have just heard. A. To know whether they read the book or whether they understand the book. B. As a common home assignment. C. To help improve their writing. D. To monitor their research. 参考答案:A 答案解析:[听力原文] Why do teachers require their students to write a book report