5．如图，一条公路的转变处是一段圆弧(图中的)，点是这段弧的圆心，是上一点，，垂足为，则这段弯路的半径是　　　　 m．

4．已知三个不相等的正整数的平均数、中位数都是3，则这三个数分别为　　　　 ．

3．如图，中，、分别为、边上的点，要使需添加一个条件：　　　　　 ．

2．函数中，自变量的取值范围是　　　　　 ．

1．为了加快3G网络建设，电信运营企业将根据各自发展规划，今明两年预计完成3G投资2800亿元左右，请将2800亿元用科学记数法表示为　　　　　 元．

50.____ this article and tell me what you think of it.

A. Look up　　　 B. Look on　　　　　　　 C. Look into　　　　 D. Look through

语法复习：动词词义辨析

1~5 DBBDA　 6~10 CAABA　 11~15 CBBAA　 16~20 CDBDB　 21~25 AADAC

26~30 AACAB　 31~35 CDCBC　 36~40 ADCBA　 41~45 DBDAD　 46~50 BDCAD

49. He was always the last to leave in order to clean up the workroom and ____ the tools.

A. put away　　 B. take away　　　　　　 C. push aside　　　　 D. look after

48. All the students ____ their holidays to take part in planting trees.

A. gave out　　 B. gave in　　　　　　 C. gave up　　　　 D. gave away

47. Autumn is coming. The farmers are busy____ the crops in the fields.

A. moving in　　 B. sharing in　　　　　　 C. handing in　　　　 D. getting in

46. The robbers had no trouble in ____ the bank, but when they came out ,the police were waiting for them. 　　 A. breaking out 　　 B. breaking into　　 C. breaking up　　　 D. breaking away from