【简答题】B People have always had to find ways to keep food safe to eat. Methods to dry, smoke and salt food were invented thousands of years ago. The process of canning is much more recent. This storage metho...
【简答题】Locate the incorrect word or phrase in the following sentences Vaccines for some rare diseases are given only to persons which risk exposure to the disease. Because it is a healthful way to exercise, ...
【简答题】Choose the right description of the part of sentence underlined. (选出对句子画线部分结构描述正确的选项.) 1.It is sometimes hard to understand each other.? A.主语 B.谓语 C.宾语 D.表语 2.I think this is a good way of impr...
【单选题】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...
A.
Pasteur's influence on the development of the microscope.
B.
The origin of the theory of spontaneous generation.
C.
The effects of pasteurization on food.
D.
Pasteur's argument against the theory of spontaneous generation.