What does the professor mean when he says this?
A.Let"s review the material we just covered.
B.Let"s slow down because we"re going again in a while.
C.Let"s take a break and start the class again in a while.
D.Let"s move on to the next topic.
第3题
基因工程的基本操作:(1)______(2)______(3)______(4)______(5)______(6)______(7)______。
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