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A．Bacteria that we used to worry about may help to solve the environmental problems.
B．Bacteria will either destroy or build the natural world.
C．Human beings can control the nature without the help of bacteria.
D．People should be more aware of the environmental problems.
答案
更多“A．Bacteria that we used to worry about may help to solve the environmental problems.B．”相关的问题
第1题
Scientists have found that some bacteria have attached to wavy-looking "hairs" called flagella. The flagella rotate, pushing the bacteria through the water. Others can glide along over surfaces by some little-understood mechanism. Bacteria are so small that they are influenced by the movements of the chemical molecules around them. They are active all the time. Even the bacteria without flagella often bound about in the water. They are pushed here and there, colliding with the watery molecules.
Bacteria cannot be detected because they don't produce bad odor or change the color or texture of the food. Therefore, when people eat the food with many bacteria, they are likely to get hepatitis A, acute gastroenteritis and a host of other illnesses. Many households have refrigerators to prevent from bacteria. Of course, freezing food slows or stops-the growth of bacteria, however, when food is thawed, the bacteria will become reactivated. Bacteria can not be totally destroyed before the food is thoroughly cooked. We need to know that not all bacteria are in connection with illness. Just some bacteria can cause disease. They are called pathogenic bacteria. Fortunately our immune system can protect us from them.
Bacteria are prokaryotes (single cells that do not contain a nucleus). It may seem weird to classify organisms according to such details, but with or without a nucleus is not trivial at all. The division between prokaryotes and eukaryotes (all organisms with a nucleus inside their cells) is of extreme importance in biology, and is the result of a major evolutionary breakthrough. Visit our program tomorrow if you want to know more, thank you.
Which of the following is true according to the first paragraph？
A．Bacteria are as big as a pinhead.
B．Bacteria can not be seen by an ordinary microscope.
C．Bacteria are hard to see because they often live together.
D．Bacteria are very small so they can only be measured in microns.
第2题
A．Bacteria can help control some pollution problems.
B．Bacteria can eat gasoline in the sea.
C．Bacteria can excrete (排泄) hydrogen and oxygen.
D．He thought bacteria just caused illness.
第3题
The author implies that bacteria were investigated earlier than viruses because
A．bacteria are easier to detect.
B．bacteria are harder to eradicate.
C．viruses are extremely poisonous.
D．viruses are found only in hot climates.
第4题
Which of the following is true according to the first paragraph？
A．Bacteria are as big as a pinhead.
B．Bacteria can not be seen by an ordinary microscope.
C．Bacteria are hard to see because they often live together.
D．Bacteria are very small so they can only be measured in microns.
第5题
It was dark. We decide to _______ for the night at a beerhouse.
A．put away
B．put down
C．put up
D．put on
第6题
Professor Smith is someone we all______.
A．look up to
B．look into
C．look through
D．look down upon
第7题
A．ideal
B．favourable
C．good
D．severe
第8题
If we wait until the landlord ______ to repair the roof we'll all die of exposure.
A．puts up
B．does up
C．sees fit
D．fakes on
第9题
On the other hand, we must also(把他们看作是有生命的) since they are able to multiply in unlimited quantities.
第10题
What do we learn about Japanese trains？
A．People tend to be asleep on the trains.
B．People usually read newspapers there.
C．They always leave and arrive on time.
D．There are always not enough trains.
