Bonnie Lachlan loves snow. It’s a good thing, _________ she lives in a very snowy, windy and cold place in Wyoming, America.

When Bonnie was 11 years old, she decided to _________ snow for her school science project. She asked a simple question: how can we make snow fences （防雪栅栏） better? Snow fences are _________ in Wyoming because there is much snow. The fences keep the snow off roads. They also protect farm animals _________ the wind and snow. Bonnie’s experiments look simple, but the result is interesting. In _________ first experiment, Bonnie used soap powder （粉末）. The soap powder was like snow. She made wind with a fan and measured （测量） the soap powder. After that, she made _________ fences and measured real snow.

Every year, Bonnie makes new fences. During a snowstorm, she measures wind speed. Then after the _________, she measures the snow on her fences. “Some kids call it crazy,” says Bonnie. “Days with 32-kilometer per hour winds are my favorite snow days.”

Bonnie _________ her research from her experiments at her school science fair. She also competed in science competitions with students from around the world. In one competition, she won $8, 000 and a computer.

Next, Bonnie is going to _________ the plant called sage （鼠尾草）. These Wyoming bushes are like a natural snow fence. She’s going to build her biggest and best snow fences ever. We don’t know _________. Maybe “very cool” is enough!

① ___ can animals shake?

When we get wet, we need a towel (毛巾) to get ourselves dry. When a dog gets wet, all it needs is to shake its body. A study shows that a wet dog can shake off half the water on its body in less than a second. In fact, this common act of a dog works better than a washing machine.

The study found that animal shaking begins with the head and ends with the tail. During a shake, the animal’s head and skin all move. Smaller animals must shake faster than bigger animals to get water off. For example, in one second, a rat can shake 18 times, a dog 6 times, and a bear 4 times. Bigger animals can get their body dry with fewer shakes.

For animals, shaking is not just about getting themselves dry. It is also about saving their lives. Being wet makes animals heavier, and that makes them harder to run. ② In the animal world, how fast an animal can ___ often decides whether it will live or not. Maybe that is why the “wet-dog shake” has become a common habit of many animals.

How to be an excellent teenager

Hello, everyone! I’d like to share my ideas about how to be an excellent teenager.