"In my old house, neighbors would get disturbed by the constant chirping（鸣叫声）of birds," Harsukh said. "Though they would never complain, I still thought that these birds need a space of their own."

　　Today, about 3,000 birds visit Harsukh's farm several times a day. He and his family have built several stands for them, and make sure to add grains twice a day.

　　Over 1,000 birds build their nests on the farm, and have their babies here. Harsukh and his family protect them from enemies until they are ready to fly. During the rainy season, the doors of the Harsukh's house are always open to birds that are seeking shelter from the rain.

24.What can we infer about the outside of Harsukh's window?

　　A. It's quiet. B. It's dirty. C. It's interesting. D. It's beautiful.

25.Which of the following can replace the underlined word "conundrum" in Paragraph 3?

　　A. sight B. business C. pleasure D. problem

26.Why did Harsukh move his house?

　　A. It was too crowded for so many birds.

　　B. It was convenient for birds to get food.

　　C. He needed a special place to feed birds.

　　D.His neighbors complained about the bird noises.

27.What does Harsukh do for the birds besides feeding them?

　　A. He protects their young birds. B. He kills their natural enemies.

　　C. He builds nests for them. D. He treats the sick birds.

　　　　　　　　　　　　　　　　　　　　　　　C

In the US, tornadoes(龙卷风） are responsible for 80 deaths and more than 1,500 injuries each year. Although they happen quite frequently, tornadoes are difficult to predict. Why? Tornadoes develop from storms, but only some storms are likely to become tornadoes. Scientists don't know where and when a storm will touch the ground and turn into a tornado. Today, the warning time for a tornado is usually just 13 minutes.

Time Samaras is a strom chaser. His job is to find tornados and follow them.When he gets close to a tornado, he puts a special tool called a turtle probe on the ground. This tool measures things like a tornado's temperature, humidity (湿度), and wind speed. With this information, Samaras can learn what causes tornadoes to develop. If meteorologists(气象学家) understand this, they can warn people about tornadoes sooner and save lives.

How does Samaras hunt tornadoes? It's not easy. First, he has to find one Tornadoes are too small to see using weather satellites. So Samaras can't rely on these tools to find a tornado. Instead, he waits for tornadoes to develop. Every May and June, Samaras drivers about 40,000 kilometers aross an area known as ToknownTornado Alley, looking and hoping to spot a tornado.

Once Samaras sees a tornado, the chase begins. But a tornado is hard to follow. Some tornadoes change direction several tines-for example,moving east and then west and then east again. When Sanaras finally gets near a tonrnado, he puts the turtle probe on the ground. Being this close to a tornado is terrifying. Debris (碎片) is flying in the air . Then wind is blowing at high speed. He must get away quickly.

The work is risky, even for a skilled chaser like Samaras. But danger won't stop his hunt for the