我们中华民族是礼仪之邦，自古强调“为人子，方少时，亲师友，习礼仪”。西方也有“礼节是通行四方的推荐书”的谚语。这表明（    ）

①礼貌待人是人们崇尚的美德                                 ②礼貌和礼仪是个人素养最直接的外在表现

②礼貌和礼仪对一个人的成功没有任何影响         ④言谈举止彬彬有礼是我们赢得别人尊重的前提，也是成功交往的条件之一

根据对话内容，从方框内选择恰当的句子将对话补充完整。（选项中有两项是多余的）

A: Hi, Jason. Would you like to come over to my home this weekend?

B: ____What are we going to do together?

A: We're going to play chess on Saturday morning and I am going to cook noodles for you.

B: Are you joking?____

A: Of course I can. I've learned cooking on TV.

B: ____

A: For two days. My parents have been away on business so I cook by myself.

B: When will they come back?

A:____ During these days, I have to do a lot of things alone.

B: I'm sure you will have a special experience.

A: Yes. ____I like trying new things.

B: You bet! See you then.

A: See you.

如图是元素周期表中磷元素的相关信息，下列说法正确的是 （  ）

动物细胞培养是动物细胞工程的基础，如图所示，a、b、c表示现代生物工程技术，①②③表示其结果，下面说法不正确的是(　 　)