Benjamin Franklin was a great scientist .He was the youngest of the 46 boys in his family . He was a clever boy, 47 cleverer than his nine brothers . He studied in school for only three years . He 48 to learn new things .He 49 worked on new ideas even when he was a child . There are a lot of stories about him and here’s one of them.
One day in winter Benjamin Franklin learned from one of his 50 that something black in colour holds heat 51 than something white in colour “ Is that true ?” he asked himself . He wanted to know the answer.
It happened to be a 52 day and there was snow on the ground. He put two large pieces of cloth over the snow . One piece was black in colour and the other was white . The sun shone (照耀)
53 the two pieces of cloth .Two hours later ,Franklin took off the cloth and found that the snow under the black cloth melted (融化) more 54 than the snow under the white cloth.
He was happy that he had learned 55 from his friend.
One day in winter Benjamin Franklin learned from one of his 50 that something black in colour holds heat 51 than something white in colour “ Is that true ?” he asked himself . He wanted to know the answer.
It happened to be a 52 day and there was snow on the ground. He put two large pieces of cloth over the snow . One piece was black in colour and the other was white . The sun shone (照耀)
53 the two pieces of cloth .Two hours later ,Franklin took off the cloth and found that the snow under the black cloth melted (融化) more 54 than the snow under the white cloth.
He was happy that he had learned 55 from his friend.
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(2) 
，
互为相反数，
，
互为倒数，
的值.
下面是按一定规律排列的一列数：
第1个数：
；
第2个数：
；
第3个数：
；
……
第
个数：
．
那么，在第10个数、第11个数、第12个数、第13个数中，最大的数是（ ）
3．已知：a为有理数，a3+a2+a+1=0，求1+a+a2+a3+…+a2012的值．
4．已知：
，
，求ab的值。
5．当整数k为何值时，方程9x-3=kx+14有正整数解？并求出正整数解
第1个数：
；第2个数：
；第3个数：
；……
第
个数：．那么，在第10个数、第11个数、第12个数、第13个数中，最大的数是（ ）
| A．第10个数 | B．第11个数 | C．第12个数 | D．第13个数 |
4．已知：
，，求ab的值。5．当整数k为何值时，方程9x-3=kx+14有正整数解？并求出正整数解
-5的绝对值是 （ ）
0 113135 113143 113149 113153 113159 113161 113165 113171 113173 113179 113185 113189 113191 113195 113201 113203 113209 113213 113215 113219 113221 113225 113227 113229 113230 113231 113233 113234 113235 113237 113239 113243 113245 113249 113251 113255 113261 113263 113269 113273 113275 113279 113285 113291 113293 113299 113303 113305 113311 113315 113321 113329 366461
A． | B．5 | C． | D．-5 |