Choose the best answer to complete the following sentences.
Mum................away on business quite often.
A.sets     
B.does  
C.takes  
D.goes

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Read the passage carefully, then choose the best answer for each question.
FREAKY FORCES OF NATURE
When Weird Weather Strikes
Most of us know about fires, hurricanes, droughts, and floods. But from time to time, Mother Nature  surprises us, and delivers a weather event that is really weird. Here are some examples of truly weird weather.
One day in 2005, residents  of a small town in Serbia looked out their windows and saw an unusual sight. It was raining frogs! Without any warning, they found their streets filling with the little jumping creatures. “There were thousands of them," one resident told a local newspaper. "I thought perhaps a plane carrying frogs had exploded,"  said another. Scientists think a tornado passed over a lake. It sucked up animals that lived there. The frogs were carried into the air. Then they were dropped in the Serbian town, far away.
As if tornadoes aren't dangerous enough, some of them can actually be made of fire. When a wildfire reaches very high temperatures, it causes the air to become hot and to rise. Cooler air rushes in to replace the hot air. This creates strong winds. These winds suck up burning plants and even the fire itself. When this happens, like it did on March 14, 2014, in Denver, Colorado, U.S.A., a tornado of fire is produced. This tornado can become 15 meters (50 feet) wide and grow as  tall as a 40-story building.
In 1942, hundreds of thousand-year-old skeletons were found under the ice of Lake Roopkund in the Himalayas. Many had holes in their skulls. But they weren't hurt in any other way. Scientists thought the people must have been hit from above. But for years, the cause of their deaths was a mystery. Today, scientists think these people were killed by giant hailstones—balls of ice. Hailstones form when raindrops high in the sky turn into pieces of ice. The ice pieces increase  in size until the wind cannot hold them up. This results in hailstones falling to the ground, often at speeds of over 160 kilometers (100 miles) an hour. For the unlucky people at Lake Roopkund, there was nowhere to run. They were all killed by the hailstones.
The word “this” refers to the moment when_____.
A.a wildfire grows really big
B.rushing winds suck up the fire
C.the tornado of fire becomes 15 meters wide
D.a wildfire causes the air to become hot and to rise

Read the passage carefully, then choose the best answer for each question.
A WARMING WORLD
One weekend in May 2010, the weather forecast for Nashville, Tennessee, U.S.A., predicted 10 centimeters (4 inches) of rain. By Sunday, over 33 centimeters (13 inches) had fallen. Soon the city was flooded. On the roads, cars were covered by the rising water. "We've got buildings running into cars,” the news reported as a small building floated by. There were 11 deaths that weekend.
Changing Weather
The weather is changing. Over the last few years, heavy rains have caused floods in Brazil, Pakistan, and Thailand. Droughts have struck Russia and Australia. Heat waves have killed thousands in Europe, and all over the world, hurricanes and tornadoes strike more frequently and with greater force than ever before. In 2011 alone, losses caused by the weather cost the world 150 billion dollars.
Warmer and Wetter
As more wild weather events happen, a worried world is beginning to ask questions like: What is going on with the weather? And why? Many also want to know: Is this natural, or are we to blame?
The answer seems to be: a little of both. Wild weather is natural. But most scientists agree human activity has made the Earth warmer. This global warming makes heat waves more likely to occur. The higher temperatures also cause more water to enter the air. This causes heavier and more frequent rain. Some scientists also believe global warming makes hurricanes and other storms stronger.
This means we're likely to see more wild weather. "[But] we don't have to just stand there and take it," says scientist Michael Oppenheimer. He and other experts say we need to stop the Earth from getting warmer. We also need to be prepared, to do things that will help save lives.
What is the main idea of the reading passage?
A.There was a deadly flood in Nashville, Tennessee, U.S.A.
B.Global warming is causing wilder weather events.
C.Wild weather events are making people very worried.
D.Flood is caused by global warming.