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问题 单项选择题

用半径为R的圆弧外切连接两个半径分别为R1，R2的圆弧．确定连接画弧圆心的方法为：分别以两己知圆弧的圆心O1，O2为圆心，以（）为半径作圆弧，其交点即为连接弧的圆心O。

A.R一Rl、R一RZ

B.R+Rl、R+RZ

C.Rl一R、RZ一R

D.R一Rl、R+RZ

答案

参考答案：B

问答题 简答题

皮太软或太硬做出来的月饼会怎样？
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填空题

短文填空：先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的单词。使短文完整。所填单词必须在答题卡标有题号的横线上完整写出。（本大题共10空，每空0.5分，共5分）

On Thanksgiving Day. About 88 percent of Americans eat turkey. But one l   小题1: turkey not only survives but also becomes famous! Every year, turkey farmers p     小题2:a turkey to the U.S. president. However the president does not e      小题3:this turkey. But gives in a “pardon”. The turkey is s       小题4:to Florida for a Thanksgiving parade. Then it lives on a farm for the r       小题5:of its life.

Turkeys come from North America and have been part of American culture for c      小题6:. Benjamin Franklin even wanted the turkey, i   小题7:of the bald eagle, to be America’s icon.

Turkeys living on farms are large birds that cannot fly. But w       小题8:turkeys are quite fast. They can fly at a s      小题9:up to 88 kilometers per hour. They can also run as fast as 40 kilometers per hour.

Turkeys don’t have ears. They h            小题10:with a snood (肉垂) above their beaks. But their hearing is five times better than human’s.
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