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A．majority
B．distribution
C．rest
D．stability
答案
更多“Most chemical reactions of an organic compound involve only a few of its numer-ou”相关的问题
第2题
In chemical works there are many waste materials, most of which ______ (在物定情况下可以转化为有用的东西)
第3题
What wilt the next paragraph most probably discuss if the passage continues？
A．Coal liquefaction as a solution to energy problems.
B．The production of biologically derived chemical fuels.
C．The difficulties in developing portable chemical fuels.
D．Hydrogen as an ideal replacement for chemical fuels in the future.
第4题
A.during sleep
B.in the endocrine glands
C.under control of the nervous system
D.during strenuous exercise
第5题
Which of the following is TRUE of chemical weapons of invasive species？
A．It is difficult to find the chemical weapons of invasive species.
B．The most prominent chemical weapons of invaders explain their success.
C．The less chemical weapons invaders have, the more benign they become.
D．Most native plants don't have the same chemical weapons of aliens.
第6题
Home Fire Safety Precautions
It's a good idea for every home to have at least one multi-purpose fire extinguisher.
Keep one in plain sight in the kitchen, and consider others for the garage and for the workshop places where firefighters say fire is most (144) to occur.
Buy a dry chemical extinguisher rated for Type A, B and C fires.
This ABC rating (145) wood, paper and fiber fires, flammable liquids such as grease and petroleum products and electrical fires. (Type D is for chemical fires, less likely in the home.)
The gauge near the spout indicates how many pounds of chemical and pressure are left for use. Get the extinguisher recharged after any (146) use.
(44)
A．like
B．likelihood
C．likeness
D．likely
第7题
A、Computer scientists and software engineers care about the same thing
B、Software engineers always try to find all kinds of solutions for the target software system
C、Computer scientists' job is to find the most suitable solution for software system
D、The relationship between Computer Science and Software Engineering is just like the one between Chemistry and Chemical Engineering
第8题
Americans this year will swallow 15,000 tons of aspirin, one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild, and it is cheap.
For millions of people suffering from arthritis(关节炎), it is the only thing that works. Aspirin, in short, is truly the 20th century wonder drug. It is also the second largest suicide drag and is the leading cause of poisoning among children, it has side effects that, although relatively mild, are largely unrecognized among uses.
Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of the leaves and tree bark which today are known to contain salicylates(水杨酸盐), the chemical in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.
A small quantity of aspirin(two five-grain tablets) relieves pain and inflammation(炎症). It also reduces fever by interfering with some of the body's reactions. Specifically, aspirin seems to slow down the formation of the acids involved in pain and the complex chemical reactions that cause fever. The chemistry of these acids is not fully understood, but the slowing effect of aspirin is well known.
Aspirin is very irritating to the stomach, and many aspirin takers complain about upset stomach. There is a right way and a wrong way to take aspirin. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice and drinking that.
A good title for this article would be______.
A．Why I Take Aspirin
B．The Side Effects of Aspirin
C．Aspirin: The Most Popular Medicine in the World
D．Aspirin, a Good Medicine
第9题
听力原文：W: Your glasses are fine. If you don't like the frames we could change them.
M: Actually I was thinking of trying some contact lenses, if you think that I would be able to wear them.
Q: Where does this conversation most likely take place？
(14)
A．In an art gallery.
B．In a chemical laboratory.
C．In an optical shop.
D．In a man's wear store.
第10题
M: A water purifier？ You want to carry even more equipment with you on our hiking trips？
W: If it's lightweight and saves work, yes. And this one fits that description.
M: Really？ I bet it takes up a lot of room.
W: Not at all. It's a straw. Much like the one you use to drink a soda or milkshake.
M: Really？ That is small.
W: Ya. It's a plastic, and has a series of mineral and chemical filters that strain harmful microbes from water.
M: Yes. But how good a job can it do filtering the germs out of stagnant pond water or water from lake and streams？
W: It's fantastic. It makes the water entirely germ free.
M: But, what about salt or chemical pollutants that maybe in the water. Does it clean those out？
W: No, it doesn't remove salt and chemicals, but those are not really major concerns when we're out hiking and camping.
M: Mm. How long will a straw last？
W: For about 100 gallons, but don't worry about measuring that large amount of water. There is a built-in safety feature. The mineral and chemical filters become clogged long before the limit has reached and the straw stop drawing water.
M: I think I'll get one for my camping trip this weekend. It'll sure be carrying a lot of water or having to boil it at the camp site.
Where will the special straw probably be most useful？
A．In restaurants.
B．On camping trips.
C．In science laboratories.
D．On car trips.
