下图是克隆羊多莉的培育过程，请回答： （1）多莉的产生没有经过精子和卵细胞的结

Have you ever wanted to travel back in time? What about traveling into the future? There’s an easy way to do it. One way you can make a time travel journey is by writing a letter to your future self to be opened in the future. To your future self, the letter will be a visit from the past.

What can be gained by writing a letter to yourself? Depends on how good your letter is. You have the chance to say something to your future self. What would you want to communicate? You’ll be able to talk to yourself 5,10,15 years down the road. There may be instructions for your future self, or you may have goals that you will want to check up on.

There are a lot of things you could include in your letter or letters to yourself. The more you include, the better the letter will be to you. Be creative with what you put in your letter. Include a picture of yourself or family to show the period from which the letter came.

You can store your letter in many different ways. You can give your letter to a friend or family member to keep and mail to you. If you can get others to take part, have them write letters to themselves as well and ask someone to be the letter holder until it’s time to send the letters. You can also use a service online to store your letter and e-mail it to you.

小题1:How can you travel into the future?

A．By traveling back in time.

B．By paying a visit to the future

C．By opening a letter from the past.

D．By writing a letter to your future self.小题2:If you want to gain more in the future, you should_________.

A．have the chance to say something to your future self

B．talk to yourself 5, 10, 15 years down the road

C．write more about instructions for your future self

D．include as many things as possible in your letter小题3:Why do you put a picture in your letter?

A．To check up on your goals.

B．To share your feelings with your family.

C．To show the time when the letter was written.

D．To find out your thoughts and feelings now.

若有以下说明和语句，则值为6的表达式是______。 struct stu { int n；struct stu*next； }； struct stu a[3],*p； a[0).n=5；a[0].next=&a[1]； a[1].n=7；a[1].next=&a[2]； a[2].n=9；a[2].next='\0'； p=&a[0]；

A．p++-＞n

B．p-＞n++

C．++p-＞n

D．(*.n++

患者女，16岁。诊断为青少年牙周炎，X线片：双侧下第一磨牙近远中牙槽骨垂直吸收根长的1／2。下列最不可能出现的体征是（）

A.牙齿松动Ⅰ～Ⅱ度

B.牙龈退缩

C.牙龈呈实质性的增生

D.创伤

E.根分叉病变

信息沟通的定义是什么?

库仑分析法的定量是（）。

A.能斯特方程式

B.滴定剂所消耗的量

C.电解过程所消耗的电量

D.称量电极上析出的被测物质的质量