依据氧化还原反应：2Ag^＋（aq）＋Cu（s）═Cu^2＋（aq）＋2Ag（s）设计的原电池如图所示。

请回答下列问题：

基因工程的核心是（   ）

    During holidays，Kitty usually goes to see the exhibits in many museums，such as the history museum，the art museum，the museum of science and technology and the museum of natural history．There are thousands of wonderful things in museum.There are paintings，sculptures(雕塑)，costumes(服饰)，swords(剑)，ancient animal bones and plants，stuffed animals(动物标本)and many others．It is always a good review of history to visit those museums．It is also a great way to learn more things by myself．

某可逆反应的正反应是吸热反应，温度对此反应的正、逆反应速率影响曲线如图所示，其中正确的是（   ）