Read the passage carefully, then choose the best answer for each question.
A PENGUIN FAMILY
Emperor penguins are the largest penguins on Earth. Each adult is over a meter tall, and can weigh1 up to 40 kilograms.
For many months each year, emperors live near the sea in large groups called colonies. However, in May, the weather  gets colder and ice covers large areas of ocean. Each colony moves many kilometers from the water. There, each mother penguin lays just one egg. Then all the hungry mothers must walk back to the ocean to find food. The father penguins put their eggs on top of their feet, under a special piece of skin called the brood pouch.
Sharing the Work
For two months, the father penguins keep the eggs safe and warm. They do this through some of the coldest weather conditions on Earth. By July, it is winter in Antarctica. Most animals leave for warmer places, but the father penguins stay. In this time, without food, a father penguin can lose almost half of his body weight.
New Life
By August, the babies begin to hatch! The mother penguin returns just in time to see her baby come out of its egg. The chick is then moved to her brood pouch. This can be difficult. If the chick falls, it can freeze quickly, so the penguin parents must be very careful. Once this is done, the father penguin can go back to the ocean to find food.
Growing Up
Over the next few months, penguin parents take turns going to the ocean for food. They each make the trip several times, bringing back food for the chick. The chick grows quickly and is always hungry.
Into the Water
By December, winter is ending. The chick is five months old and can live on its own. Soon it enters the water for the first time. It will swim and eat until next April, and then return here. After a few more years, it, too, will start its own family.
What will probably happen if the chick falls onto the ice?
A.Another penguin will take the chick.
B.The chick will die because of the cold.
C.The father penguin cannot go find food.
D.The mother penguin will not return.

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Read the passage carefully, then choose the best answer for each question.
SEEING THE IMPOSSIBLE
Can you believe everything you see? Not always! Sometimes our minds and our eyes make mistakes. At other times, our eyes and minds can become confused. This may be because we are looking at something called an optical illusion.
The word optical means "related to sight"—the way we see things with our eyes. An illusion is something that looks different from the way it really is. In short, an optical illusion is a kind of trick that our eyes play on us.
Look at these optical illusions and compare what you see with what your classmates see. The way we see things is often personal, so you may not see things the same way as someone else.
So can you trust your eyes? Perhaps the answer is “sometimes." Sometimes our eyes see something, and our minds understand it easily. At other times, we may need to look twice.
Which red dot is larger?
Most people say it’s the dot on the left. Now measure the dots. The red dot on the left may seem larger because of the blue dots around it, but they’re really the same size.
Look at this picture. What do you see?
Do you see a cup, or do you see two faces? Now look again! The illusion shows two different images at the same time. Therefore, our minds have to choose which image to look at. Scientists think this choice is difficult, because different parts of your brain are getting different information. One part "sees" the cup and another part "sees" the faces, so the image keeps changing.
Are the circles moving?
When you stare at this picture, your mind may tell you that the circles are moving, but this is impossible! How can a picture move? Some people think the circles seem to move because, often, when we see circle-in-circle shapes, like in car wheels or snake bodies, they are usually moving. Our brains are used to seeing these shapes move. So when our eyes see this shape, our mind infers that the image is moving. Other scientists believe the illusion of movement is caused by the tiny movements of our eyes as we look at the different colors and patterns of the picture.
The word “tiny” can be replaced with______.
A.very fast
B.very small
C.very strange
D.very large

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.
What happens when little pieces of ice move around in the wind?
A.They become bigger.
B.They become raindrops.
C.They fall to the ground as snow.
D.They are stuck in the wind.

Read the passage carefully, then choose the best answer for each question.
THE ROBOTS ARE COMING!
The year is 2045. A goal is scored at the soccer World Cup. Not by a human player, but by a robot. A robot? Is that possible? Many scientists believe it is. In fact, there are already robots that can play soccer. Of course, today's robots don't just play sports. Today's scientists are working on robots with various skills. For example, it is very possible that robots will soon help take care of children or the elderly,  or do dangerous jobs such as fighting fires.
When people started making robots, they were made to do just simple things, mainly in factories. Since then, however, robots have changed a lot. Early robots were operated by humans. Today's robots function on their own. Some can only move around a little, like robot vacuum cleaners,  but others, such as Honda's ASIMO, can do much more. He can run, climb stairs, dance, and yes, even play soccer.
Then there are robots designed to be like humans. These robots have faces and can show emotions. Such robots can learn new things, and show us how they "feel.'' Actroid-DER—a social robot—looks so human, she sometimes makes people feel uncomfortable.
Animal-bots
Scientists aren't just building humanlike robots. They are also making  robots that look and act like animals.
At NASA, scientists are making a robot snake. They think it's a good alternative to vehicles with wheels. These snake-bots can enter holes and move over rough ground. They might one day help scientists look for signs of life on Mars. Other animal robots include the frog-bot, which can jump over objects, and the sticky-bot, which can walk up walls. There's even a robot called Water Runner that can walk on water.
But can a robot soccer team ever operate all on their own, or play as well as a human team? Many robot scientists definitely think so. Among the robots of today are Honda's ASIMO (top left), the NASA snake-bot (bottom left), and Actroid-DER—the social robot (right). Anything is possible. One day, they may even be world champions!
The word “they” refers to______.
A.vehicles
B.wheels
C.holes
D.snake-bots