项奶奶已经90岁高龄了，在她90岁生日的时候，项奶奶的儿孙们齐聚在家为她祝寿。你认为项奶奶的家庭结构属于[ ]

A．核心家庭

B．主干家庭

C．单亲家庭

D．联合家庭

假定英语课上老师要求同桌之间交换修改作文，请你修改你同学写的以下作文。文中共有10处语言错误，每句中最多有两处，错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意: 1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Dear Tom,

I'm very glad to learn from your e-mail that you and your parents will come to Shanghai

and call on me in April 30th. But I'm terrible sorry that I can't meet with you at Shanghai

Pudong International Airport because I have to attend a meeting in Beijing. Now let me tell you the way to your home. When you get out the airport, you can take Bus NO.936 to Rainbow Hotel Shanghai. Walking across Xianxia Road to the west till you see the supermarket on your right. Turn to the left there and go straightly on. Then you can see a bank on your left. The apartment building I lived in is next to the bank. Find Room 601 that my mother will be waiting for you.