超星 - Multiple Choice

单选题

In line 97, filling that gap means

A. covering the space between the sun and the Earth
B. adding to our knowledge about objects that could strike the Earth
C. measuring the gap between the ground and a falling object
D. completing our understanding of why objects explode above the Earth

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单选题

According to the passage, what are astronomers doing so we are better prepared for a possible asteroid strike?

A. building early-warning systems
B. equipping rockets with nuclear bombs
C. compiling a list of asteroids
D. studying the craters created by asteroids

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单选题

Which method of deflection wouldn't work well ona rotating asteroid?

A. exploding a nuclear bomb nearby
B. hitting it with a spacecraft
C. pulling it using gravity
D. landing on it and pushing it

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单选题

What might change the course of Apophis so that it hitsthe Earth within the next 30 years

A. Its own gravity
B. a spacecraft's gravity
C. the Earth's gravity
D. a comet's gravity

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单选题

Sputnik, the first satellite in space, weighed less than a refrigerator

A. less than 85 kilograms(190 pounds)
B. less than 170 kilograms(370 pounds)

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单选题

The number of people in space right now can be counted on one hand

A. 5 or less
B. more than 5

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单选题

The Hubble Telescope is about as long as a school bus

A. 13 meters(40 feet)
B. about 25 meters (80 feet)

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单选题

Astronauts can now fly to the International Space Station in the time it takes to watch three movies

A. around two hours
B. round six hours

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单选题

Another title for this reading could be _____

A. Water for the Rich. Not for the Poor
B. a. Why We Waste Water: Two Points of View
C. Water Shortages and Problem Solver
D. Politics and Water: Fighting for a Drink

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单选题

Which of these statements about Castile-la Mancha is NOT true?

A. Its situation is common to many places around the world
B. Overfishing has caused a great deal of environmental damage
C. Illegal well digging is a significant problem.
D. The Los Ojos area has been dry for over 30 years.

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