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In March 2017, about 25 people 1.(invite)to a kitchen in San Francisco, California, for a tasting event. On the menu? Fried chicken grown in a lab by scientists from Memphis Meats.

The company makes meat by 2.(safe)extracting(提取)cells from animals such as chickens, ducks, and cows. Then 3. feeds the cells nutrients(营养物).Those cells grow, 4.(form)muscles, which are meat. Memphis Meats is one of several companies in the world making lab-grown meat. Why do they produce lab-grown meat?

Producing meat with 5.(tradition)methods requires lots of cows. And cows give off a gas that traps heat in the atmosphere, which contributes 6. climate change. Raising cows takes up space, too. But lab- grown meat production requires fewer cows and less land. The cells taken during one extraction can make 7.(much)meat than "any single animal could ever produce”.

Lab-grown meat is not yet sold in supermarkets. Before that can happen, it will need to be affordable. The 8. (one)lab-grown burger, 9.(produce)in 2013 by Mosa Meat, cost over $300,000 to make. Costs are dipping. But they can't yet compete with regular ground beef, 10. is about $4 a pound.

高三英语语法填空中等难度题

少年,再来一题如何?
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