CXD-weaken-T13

paopao

13. According to a 1980 survey, ten percent of all United States citizens over the age of sixteen are functionally illiterate . Therefore, if the projection that there will be 250 million US citizens over sixteen in the year 2000 is correct, we project that 25 million of these citizens will be functionally illiterate.

weaken

B From 1975 to 1980 there was a three-percent decrease in the rate of functional illiteracy among US citizens over teh age of sixteen.

ans. B

I wonder why b is correct since the period of from 1975 to 1980 is not consistent with the passage , that is accoring to the survey in 1980 to get the conclusion in 2000.

Thanks.

dashasha

请以后把题目贴全吧。原文说1980年文盲率是10%，所以推测2000年文盲是25M。选项B就说明2000年的文盲率和1980年的不一样，所以不能用1980的文盲率来推断2000年的情况啊。

paopao

dashasha

谢谢你的答复 你的意思我理解 可是B说的是From 1975 to 1980

如果是from 1980 to 1985 就没有疑问了 你能再看看吗

谢谢

dashasha

我觉得是这样的，B说1975和1980的不一样，就是告诉你每年的文盲率都不同，所以不能用A年的文盲率推出B年的文盲率啊。

paopao

谢谢 明白了