在一正方形的四角各截去全等的等腰直角三角形而得到一个小正方形，若小正方形的边长为

用所给词的正确形式完成短文。

(invite,  different,   work,   in,   popular,    do,    sport,   weekend,   or,   together)

     American people go to work five days a week. They usually have a two-day    1    which is Saturday

and Sunday.

     One weekends, people spend their time    2    all kinds of things and they do them in    3    ways. Many

families enjoy their weekends     4   . They may go shopping, go for a walk, visit friends,    5     go to church,

they may also    6    friends over and have a party at home.

      Many American families do     7   on weekends. Running biking and swimming are    8    during summer,

while skiing and stating are very common    9    winter.

     The weekend is also a time for American families to    10     in their gardens, and then weekends are

very busy.

1.______ 2.______ 3.______ 4.______ 5.______

6.______ 7.______ 8.______ 9.______ 10.______

如果把电视屏幕看作一个长方形平面，建立一个直角坐标系，若左下方的点的坐标是（0，0），右下方的点的坐标是（32，0），左上方的点的坐标是（0，28），则右上方的点的坐标是______．

甲亢患者经术前准备可以手术的基础代谢率最高为（）

A.+15%

B.+20%

C.+25%

D.+30%

E.+35%

正常人直立时，哪些椎体的棘突为水平位（）

A.颈椎，全部胸椎和上4个腰椎

B.颈椎，上4个胸椎和下4个腰椎

C.前2个颈椎，全部胸椎和下4个腰椎

D.颈椎和腰椎

E.颈椎，上3个胸椎和全部腰椎

对于长度为n的顺序存储的线性表，当随机插入和删除一个元素时，需平均移动元素的个数为 【1】 。