题目

在探究“斜面的机械效率高低与斜面的倾斜程度有什么关系”的实验中，用沿斜面向上的力F拉动小车，使小车从斜面底端匀速运动到斜面顶端，如图所示。多次改变斜面倾斜程度，部分实验数据记录在下面的表格中，根据表格中数据回答下列问题： 斜面 倾斜度小车重量 G/N斜面高度 h/m沿斜面拉力F/N斜面长 S/m有用功 W有/J总功 W总/J斜面的 机械效率 较缓100.1311333.3% 较陡100.2412450% 最陡100.4 1 6（1）当斜面“最陡”时，沿斜面拉力为        N；做的 完形填空： 　　As she waited at the edge of the ice for her music to start, Peggy took a quick look at her father standing nearby with a group of parents and teachers．He smiled at her．Then she 　　1　　 out at the audience, 　　2　　 to see her mother．These two, Alvert and Doris Fleming, had 　　3　　 all the way from California more than 2,000 miles away, to see their 　　4　　 compete in this sports meet in Cleveland, Ohio． 　　The music 　　5　　 and Peggy moved onto the ice, letting the music 　　6　　 her along into her turns, and she began skating with much 　　7　　 in herself．The cold fear she always had in the 　　8　　 seconds before skating onto the ice was 　　9　　．She was feeling the movement of the 　　10　　 and letting it carry her．She skated easily, 　　11　　 did some jumps, a final turn and her performance was 　　12　　． 　　The crowd loved it and cheered 　　13　　 she skated off the ice．“Nice job,” said one of the other 　　14　　．It was the remark(话语)that 　　15　　 came after a free-skating performance．But what should the 　　16　　 say?Standing beside her father, Peggy 　　17　　 for the scoring(打分)to be finished．On all sides were other young skaters, some waiting 　　18　　 alone, others with a parent．Shortly before 10 o’clock the results were 　　19　　．The new United States Women’s Figure Skating Champion was Peggy Fleming of Passdena, 　　20　　． (1) [　　] A． looked B． watched C． found D． stepped (2) [　　] A． failing B． looking forward C． having D． hoping (3) [　　] A． bicycled B． driven C． run D． walked (4) [　　] A． friend B． children C． son D． daughter (5) [　　] A． started B． played C． developed D． sang (6) [　　] A． allow B． set out C． carry D． support (7) [　　] A． thought B． belief C． success D． design (8) [　　] A． following B． last C． recent D． past (9) [　　] A． lost B． present C． strong D． gone (10) [　　] A． music B． fear C． ice D． audiences (11) [　　] A． so B． or C． before D． then (12) [　　] A． satisfied B． unsatisfactory C． finished D． welcome (13) [　　] A． because B． until C． before D． as (14) [　　] A． skaters B． friends C． judges D． parents (15) [　　] A． always B． seldom C． again D． hardly (16) [　　] A． players B． audience C． judges D． parents (17) [　　] A． waited B． looked C． wished D． asked (18) [　　] A． comfortably B． hurriedly C． happily D． anxiously (19) [　　] A． spoken B． explained C． announced D． unknown (20) [　　] A． England B． Cleveland C． Ohio D． California