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Questions 11 to 18 are based on the conversation you have just heard.

A. He will put on his gloves as the woman suggests.
B. He has gloves but does not feel like wearing them.
C. He does not have gloves at the moment.
D. He thinks one glove is good enough for him.

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1. 给你的朋友John写一封信，说明由于你的疏忽把他借给你的书弄丢了你给他买了一本新的； 2. 表示真诚歉意； 3. 主动提出赔偿。 A letter of Apology

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A pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300, 000 kilometers in one second. A radar set sends out short burst of radio waves. Then it receives the echoes produced when the waves bounce off objects. By determining the distance it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word "radar", in fact, gets its name from the term "radio detection and ranging". "Ranging" is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms.The main topic of this passage is the (46) .According to the passage, radar can detect the (47) besides the location of objects; and radar uses (48) , instead of sound waves.In the eighth sentence, the word "it" refers to (49) .In the second sentence, the word "dense" means (50) . 50（）

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Questions 11 to 18 are based on the conversation you have just heard.

A. He went to the island.
B. He didn’t go to the island.
C. He loved the island.
D. He saw a lot of plants there.

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Questions 11 to 18 are based on the conversation you have just heard.

A. She doesn’t feel like going to the art class.
B. She decides to change her brush.
C. She quits art and is Row studying drama.
D. She has no more paint for drawing.

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Questions 11 to 18 are based on the conversation you have just heard.

A. He will put on his gloves as the woman suggests. B. He has gloves but does not feel like wearing them. C. He does not have gloves at the moment. D. He thinks one glove is good enough for him.

1. 给你的朋友John写一封信，说明由于你的疏忽把他借给你的书弄丢了你给他买了一本新的； 2. 表示真诚歉意； 3. 主动提出赔偿。 A letter of Apology

Questions 11 to 18 are based on the conversation you have just heard.

Questions 11 to 18 are based on the conversation you have just heard.

A. He will put on his gloves as the woman suggests.
B. He has gloves but does not feel like wearing them.
C. He does not have gloves at the moment.
D. He thinks one glove is good enough for him.