1. What is this passage mainly about?

The word "it" in line 13 refers to which of the following?

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• 9. Which type of waves does radar use
• 11. Which of the following would most likely be the topic of the next paragraph

7. The word "it" in line 13 refers to which of the following?  (A) a radar set (B) a short burst (C) a radiation wave (D) light 8. Which of the following could best replace the word "bounce" in line 13?  (A) overturn (B) groove (C) extend (D) rebound 9. Which type of waves does radar use?  (A) sound (B) heat (C) radio (D) light 10. The word "tracking" in line 20 is closest in meaning to which of the following?  (A) repairing (B) searching for (C) glancing at (D) fighting 11. Which of the following would most likely be the topic of the next paragraph?  (A) other uses of radar (B) uses of sonar technology (C) other technology used by pilots (D) a history of flying tải về 0.64 Mb. Chia sẻ với bạn bè của bạn: