历年托福考试阅读真题汇总及答案.docx

历年托福考试阅读真题汇总及答案
0308 托福试题
阅读( 55minutes )
Question 1-11
If food is allowed to stand for some timeters, the fibers of which stop solid particles. After
the guncotton was dissolved in a mixture of alcohol and ether, the particles that it had
trapped fell to the bottom of the liquid and were
examined on a microscope slide .Pasteur
found that in ordinary air these exists a variety of
solid structures ranging in size from
mm to more than mm .Many of these bodies
resembled the reproductive
(15)structures of common molds, single-celled animals, and various other microbial cells .
As many as 20 to 30 of them were found in fifteen liters of ordinary air ,and they could
not be distinguished from the organisms found in much
larger numbers in putrefying materials .Pasteur
concluded that the organisms found in putrefying
materials originated
0308 托福试题


阅读( 55minutes )
Question 1-11
If food is allowed to stand for some time, it putrefies .When the putrefied material
is examined microscopically ,it is found to be teeming with bacteria. Where do these
bacteria come from , since they are not seen in fresh
food? Even until the mid-nineteenth
century, many people believed th