—Could you please tell me ________ the fancy dress?

—She bought it online, I think.

A.where Mary bought B.if Mary liked

C.when did Mary buy D.how much did Mary pay for

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The Science magazine reported that scientists had successfully grown meat in their laboratory by November, 2018. The news aroused heated discussion among the public. Is the meat safe? Is it any different? Why do we have to grow meat in a lab? People have tons of questions about this. And the scientists said that the lab-grown meat is produced when cells from animals are grown under lab conditions. It isn't like plant-based meat substitutes (替代品) made from vegetable proteins (蛋白質(zhì)), since cell-based meat is grown from actual animal cells. This means that it is an animal product, so not suitable for vegetarians.

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5.What is the passage mainly about?

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