（a+x）（1+x）⁴的展开式中x的奇数次冥项的系数之和为32，则a=____ 。

说说“山”和“海”在《山的那边》第二节诗中有什么含义。

在数轴上表示下列有理数：$\frac{1}{2}$，|﹣2.5|，﹣2²，﹣（+2），并用“＜”将它们连接起来

比较它们的大小：____ ．

Dear David,

    I'm very glad you are arriving in my city at 3:00 p.m. this Sunday. Now let me tell you the way to the Blue Sky Restaurant. I'll meet you there. Take a taxi from the bus station and go down New Bridge Avenue. Go across the big bridge. When you see a bank, turn right and go through Bank Street. You'll pass three one-way avenues: Sixth Avenue, Seventh Avenue and Eighth Avenue. When you see a big McDonald's, turn left. Then go along Green Avenue until（直到）you see New Park. Turn left and go down Center Street. The Blue Sky Restaurant is on your right.

    I hope you have a good trip.

Yours,

Larry