通过控制层面选择梯度场和射频脉冲来完成MR图像层面和层厚的选择。在完成了层面选择后还

根据中文提示，阅读来信，用英文写一封回信（要求内容连贯、语句通顺、符合逻辑，不少于

50字）。

       下面是一位英国中学生Ann想在中国寻找笔友的一封电子邮件，阅读该邮件，并用英语写一封回信，介绍自己的家庭和个人情况，介绍北京现在的环境，表达因为2008年在北京举办Olympic Games，作为中国人的激动和自豪。

Dear friend,

      My name is Ann King. I live in London, England. I'm fourteen years old. There are four people in my

family, my father, my mother, my brother and I. My father is an engineer, my mother is a housewife. My

brother and I are in the same middle school. I want to make a friend in China. China is a country with a long

history. And Beijing will hold the 2008 Olympic Games. Would you like to be my friend? Would you like to

tell me something about your family? And I'd like to know more about Beijing, too. 

                                                                                                                                               Yours, 

                                                                                                                                                Ann

Dear Ann,

      I'm happy to get your email. And I'd like to be your friend.                                                                     

                                                                                                                                                Yours 

                                                                                                                                                 XXX

基本预备费的计算基数包括()。

A．设备及工器具购置费

B．建设期贷款利息

C．建筑安装工程费

D．铺底流动资金

E．工程建设其他费

在粉底的色调中，使用后可以使脸颊显得丰满的是（）。

A.亮色

B.暗色

C.基本色

D.绿色

为了检验二氧化碳是否充满集气瓶，正确的方法是[ ]

A．加入澄清石灰水

B．滴入紫色石蕊试液

C．用燃着的木条放在瓶口

D．用燃着的木条迅速伸入瓶底

贸易创造效应，是指由于国际经济一体化组织成员国之间相互取消了关税和与关税具有同等效力的其他措施，造成了它们的相互之间贸易规模的扩大和福利水平的提高。