SỞ GD-ĐT THÁI BÌNH

TRƯỜNG THPT NGUYỄN TRÃI

ĐỀ THI OLYMPIC NĂM HỌC 2017 - 2018

MÔN: TIẾNG ANH

Thời gian làm bài: 90 phút (không kể thời gian giao đề)

SECTION A: 8 points

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct

answer to each of the questions from

A pilot cannot fly 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 kilometres in one

second. A radar set sends out a short burst of radio waves. Then it receives the echoes produced when the

waves bounce off objects. By determining the tune 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.

Question 1: What is the mam topic of this passage?

A. Alternatives to radar

B. The nature of radar

C. History of radar

D. Types of ranging

Question 2: According to the passage, what can radar detect besides location of objects?

A. shape

B. size

C. speed

D. weight

Question 3: The word “exemplified" in the passage can be replaced by ______.

A. “illustrated’

B. “specified”

C. “resembled”

D. “justified”

Question 4: The word "shouts” in the passage most closely means ______.

A. “shoots”

B. ‘"whispers”

C. “exclaims”

D". “yells”

Question 5: Which of the following words best describes the tone of this passage?

A. humorous

B. argumentative

C. explanatory

D. imaginative

Question 6: According to the passage, the distance between a radar set and an object can be determined

by______.

A. the term “ranging" used for detection of the distance between an object and the radar set

B. the time it takes for the radio waves to produce echoes and bounce off the object

C. the tune it takes for a burst of radio waves to produce echoes when the waves bounce off the

object

D. the time it takes for the echoes produced by the radio waves to return to the radar

set

Question 7: Which type of waves does radar use?

A. radio

B. sound

C. tidal

D. heat

Question 8: The word “tracking” in the passage most closely means______.

A. sending

B. ranging

C. repairing

D. searching for

Question 9: Which of the following would most likely be the topic of the next paragraph?

A. A history of flying.

B. Other uses of radar

.

C. The technology used by pilots.

D. Uses of some technology.

Question 10: What might be inferred about radar?

A. It was developed from a study of sound waves.

C. It gave birth to the invention of the airplane.

B. It takes the place of a radio.

D. It has improved navigational safety.

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

Question 11: The rate of snow accumulation in the formation area are critical to the pace of glacial

movement.

A. to the

B. movement

C. are

D. accumulation

Question 12: More murders are reported in December in the United States than for any other month.

A. are reported

B. for

C. More

D. the