题目内容
During the conversation between Billy, Yuege and Yunpeng, we took a brief look at ______ .
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Choose the most appropriate answer by completing the sentences below or answering the questions.1. In this unit, we’ve learned a lot about ______.
According to Ms. Yang, any experiment on human embryos is not allowed in _____ , while it is allowed in _____.
From Huanrui, we know that the main function of the mitochondrion is (to) _____ .
On _____, scientists announced the successful birth of a healthy baby boy, who was conceived from one sperm and different parts of two eggs.
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