根据对话内容从方框中选择能填入空白处的最佳选项补全对话，其中有两项多余。
A：Hi!David!____
B：I'm watching a cartoon．
A：____
B：Tom and Jerry.
A：What do you think about it?
B：____I like it very much．
A：____
B：It's about a cat called Tom and a mouse called Jerry．
A：That sounds interesting．____
B：Of course．
A．What's it about? B．What are you doing? C．I think it's very funny． D．I don't think I agree． E．What's the name of the cartoon? F．Can I watch it with you? G．I don't like humorous cartoons． |
）轰击氮原子，使氮原子转变成了氧原子，人类历史上第一次实现了原子的人工转变。用α粒子轰击氮原子，使氮原子转变成了氧原子的过程表示如下：
＋
＋
。下列有关说法中正确的是