科学让核辐射“变废为宝”
Nuclear radiation (核辐射) is energy from very small things. Too much radiation is bad, but scientists found safe ways to use it for good things.
Doctors use special radiation to fight cancer. They aim the radiation very carefully at the cancer. This kills the bad cancer cells and tries to keep the healthy cells safe.
Radiation also helps keep our food fresh! Fruits like strawberries or mangoes can go bad quickly. Food scientists use a little bit of safe radiation (like gamma rays) on them. This kills tiny harmful things (like bacteria or insects) on the fruit. The best part?
Ø It doesn’t use chemicals.
Ø It doesn’t make the food radioactive (有辐射的).
Ø It doesn’t leave bad stuff on the food.
It’s like giving the food a magic invisible shield to keep it clean!
So, science helps us use radiation wisely. When used safely and carefully, it’s not just scary. It’s a powerful tool that helps make us healthier and keeps our food fresher longer.
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1. 1. What do doctors use radiation to do?（细节理解）
A Help sleep.
B Fight cancer.
C Keep food fresh.
D Kill all cells.
2. 2. How can radiation help protect fruits?（细节理解）
A By adding chemicals.
B By killing harmful things.
C By making them clean.
D By leaving bad stuff.
