(All things) (consist of) atoms or molecules, which (be) constantly (moving).（　）

A:All things B:consist of C:be D:moving

Passage Two
What is wind You can feel it, and you can sometimes hear it, too. You can’t see the wind, but you can see all kinds of plants and flowers moving in the wind. Grass moves in the wind. So do trees. What is the wind It is moving air.
What makes the air move Think of two places. They may be close to each other, or they may be far away. The air is cold in one place. But it is hot in the other. Warm air pushes up high into the sky. It goes higher than the cold air. The colder air then moves into the place where the warmer air used to be. The moving air is wind.
Winds move clouds in the sky. A nice day can turn cloudy in a short while. Sometimes the clouds are big and dark. Big, dark clouds hold a lot of water. Soon it begins to rain.
High winds can make a storm come fast. They can make a lot of noise, too. Sometimes they sound like a train going by. Very high winds have picked up big things like cars and trucks from the ground. Some have even picked up houses!
But most winds are much lighter. You can have fun in a lighter wind ff you have a kite. Do you know how to fly one Just let the wind take the kite high into the sky.

A:moving air B:lighter clouds C:air pressure D:cold air

(Passengers) (are warned) not to (get off) a bus while (moving).

A:Passengers B:are warned C:get off D:moving

American people have always been moving from one place to another throughout the history of their development: The history of the American people is, (21) , the history of the movement of the American people. They moved from the colonies of the East Coast to the open space of the (22) . They moved from the country and the farm to the city. (23) , Americans have been moving from the cities to the suburbs.
Pioneer Americans began (24) from the East Coast to the West 250 years ago. They moved west for many reasons. (25) reason was that they could obtain (26) open space and land (27) farming. Americans liked large open spaces, and they liked the freedom and independence to (28) the land in their own way. Some of the land became farms. Important minerals were discovered in some areas, so some of the land became (29) . Other large areas became farms and cattle ranches. There seemed to be enough land for everybody. But it was a difficult life-- (30) of endless work and hardship.

A:moving B:travelling C:coming D:going

(Passengers) (are warned) not to (get off) a bus while (moving).

A:Passengers B:are warned C:get off D:moving

 American people have always been moving from one place to another throughout the history of their development: The history of the American people is, (21) , the history of the movement of the American people. They moved from the colonies of the East Coast to the open space of the (22) . They moved from the country and the farm to the city. (23) , Americans have been moving from the cities to the suburbs. Pioneer Americans began (24) from the East Coast to the West 250 years ago. They moved west for many reasons. (25) reason was that they could obtain (26) open space and land (27) farming. Americans liked large open spaces, and they liked the freedom and independence to (28) the land in their own way. Some of the land became farms. Important minerals were discovered in some areas, so some of the land became (29) . Other large areas became farms and cattle ranches. There seemed to be enough land for everybody. But it was a difficult life-- (30) of endless work and hardship.

A:moving B:travelling C:coming D:going

Robotic Highway Cones A University of Nebraska professor has developed robotic cones and barrels. These robotic cones and barrels can move out of the way, or into (51)_____, from computer commands made miles away. They can even be programmed to move on their own at any particular part of the day, said Shane Farritor, an assistant professor of mechanical engineering at Nebraska. For example, if workers arrived at 6 am, the cones could move from the side of the highway to (52)_____off the lane at that time. And they can return to the (53)_____place at the end of the day. "It just seems like a very good application for robots." Farritor said. "The robotic cones would also help (54)_____people from hazardous jobs on the highway putting barrels and cones into place," Farritor said in a report on his creation. Work on the idea began in 2002 using a National Academy of Sciences grant. The (55)_____allowed Farritor to work on the project with graduate students at Nebraska and his assistant Steve Goddard. The robots are placed at the bottom of the cones and barrels and are (56)_____enough not to greatly change the appearance of the construction aides. "It would look exactly the same," Farritor said. "(57)_____there’s a kind of rubbery, black base to them. We replace that (58)_____a robot." Farritor has talked with officials from the Nebraska Department of Roads about how the robots would be most (59)_____to what they might need. The robots could come in handy following a slow-moving maintenance operation, like painting a stripe on a road or moving asphalt, (60)_____now the barrels have to be picked up and moved as the operation (61)_____. "That way you don’t have to block off a 10-mile strip for the operation ," Farritor said. (62)_____prototypes have been made, they are not in use anywhere. Farritor said he has (63)_____for a patent and is considering what to do next. He is thinking about starting a small business. He is also thinking about (64)_____the robots to roads departments and others across the country who may (65) _____from them.

A:saving B:marketing C:moving D:devising