You could see mountains, craters and valleys if you looked at the Moon through a telescope（望远镜）. Galileo was the first person to see these things through a telescope. He is ________ as the farther of modern science. Galileo was great not only for his ________, but for the scientific methods he developed.

Galileo did not invent the telescope. It was first made by a Dutchman in 1608 and later Galileo ________ the design. So he was able to study the stars and planets ________. Some people call him the first astronomer（天文学家）. His telescope made things appear larger by much more times.

As he studied the sky, Galileo ________ that the planets circle around the sun. He was not the first person to believe this, but he was the first to prove details of this fact. People of that time believed that the Earth was the ________ of the universe（宇宙）and everything in space moved around the Earth. Galileo got into trouble with the government for saying that what they believed was ________. He had to take back what he said, or he would be in prison.

Galileo’s work went ________ an astronomer. He was an inventor as well. He made the first thermometer（温度计）. His thermometer didn’t tell the temperatures exactly, ________ it could show if a temperature was higher or lower or the same as another temperature.

Galileo thought about the world in a ________ way. Before Galileo, people did not run experiments or test out their ideas. He is one of the first real scientists.

Did you know that a large number of people get sick from foodborne illness each year? Luckily, foodborne illness can be prevented. Follow these three easy rules to help you.

◆ SEPARATE raw（生的）meat and eggs from other items in your refrigerator. If possible, use a different cutting board for raw meat products. This will reduce the chance of bacteria’s（细菌）spread from one food to another.

◆ CHILL（冷藏）foods to keep bacteria from growing. Bacteria are able to grow quickly at room temperature, so keep fresh foods in the refrigerator to limit this risk.

◆ COOK your food to a high enough temperature to kill harmful bacteria that may lead to illness. Use a thermometer to make sure your foods have reached a safe temperature.

Here is a chart for you to use as a food temperature guide.