题型:阅读理解 题类:常考题 难易度:普通
广西桂林中山中学2017-2018上学期英语高一上学期11月段考试卷(含听力音频)
“Why do birds sing?” I asked a group of children. “To attract metes(配偶)!” answered a boy. A 4-year-old girl added shyly, “birds sing because they are happy, and they want to make us happy, too.” I think both answers are probably true in a way. If birds sing happily, it shows all is well in the forest: no predators (捕食者) are present, and the birds can feed, sing and do other bird things. The sound of a relaxed robin(知更鸟) singing is easy to understand because it makes us feel this way too—it's a sound that lifts our own hearts when we hear it.
What happens when a predator comes into their areas? The nearby birds quickly give an alarm call, a short sound that warns, “Danger is coming!” On hearing the sound, the other birds stop singing and fly for cover, the deer lift their heads and stop moving and the rabbits run into the bushes. Suddenly, the forest becomes silent.
When humans walk through the woods in a hurry or while talking with a friend, we don't see much wildlife. We may think that there aren't many animals living there, but more likely, they know we are coming and hide minutes before our arrival. But if we learn to avoid setting off alarms, we can see many more wild animals without frightening them. To practice, find a place in a park and sit quietly for an hour. Take note as the birds begin to relax and sing again. When I do this, I am always surprised at the wonderful thing animals will do when humans simply stay still long enough.
Science camps for kids
Destination Science Young Inventors
Curious minds want to know and build. Experiment & discover the technology behind controls that operate inventions: touch, sound and motion sensors. Take home a robot dog that barks, eats, and sits at your command. Invent flipping friction racers, magnetic quiz games, 3D water-powered polymers and more.
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Early Bird Price |
Regular Price |
1st & 2nd Grade |
$350 |
$370.00 |
3rd-5th Grade |
$410 |
$430.00 |
Early bird price ends
Mar 15, 2019
Schmahl Science Physics of Motion(运动)
The physics of motion is all about forces. Forces need to act upon an object to get it moving, or to change its motion. In the tradition of Da Vinci, Galileo and Newton, students will explore forces as they build gliders and airplanes, design submarines, build rockets, learn about light, make roller coasters and build bridges.
Price
Options |
Early Bird Price |
Regular Price |
3rd-5th Grade |
$475.00 |
$500.00 |
Early bird price ends
Mar 15, 2019
Mad Science
Junior Mad Scientists explore the kingdom of the Chemical and Physical world in this crazy week of non-stop action! Kids explore our wonder lab and find eggs that don't break, ice that doesn't melt, and discover how to freeze time! Our young chemists perform impressive hands-on experiments.
Price
Options |
Early Bird Price |
Regular Price |
1st & 2nd Grade |
$338 |
$358.00 |
3rd-5th Grade |
$395 |
$420.00 |
Early bird price ends
Mar 12, 2019
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