? Fahlberg rushed back to work. He tasted everything in

　　53

　　, but they were not exactly the chemicals in the lab. Eventually, the chemist

　　54 what he was looking for: The matter in the beaker that had spilled was sweet-much sweeter than sugar. He

　　55

　　his discovery saccharin （糖精），the first artificial sweetener.

　　Dirty? delicious! If

　　this

　　56 　shows us anything, it's that we all make mistakes, and that's not 57

　　. Mistakes

　　often take us in new

　　58

　　and help us invent new things. People who say something is impossible aren't always right.

　　A lot of things were “impossible” before someone 59

　　how to do them.

　　If you don't

　　60

　　right away, don't be afraid to try again and again.

　　41、 A、 food

　　B、drinks

　　C、 plants

　　D、 things

　　42、 A. dish

　　B、 candy

　　C、 bread

　　D、 surprise

　　43、 A、good

　　B、 careless

　　C、hard

　　D、 absent

　　44、 A、automatically

　　B、 accidentally

　　C、 naturally

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