Going Zero Waste means more than just managing the rubbish we create．It means reducing it too．While it might seem like a difficult thing to do, it's well worth it．And what better time to start than Christmas?
We need to copy the way Nature wastes nothing．Many things are created by human society that we know will soon become useless and be thrown out．How many plastic bottles or even PCs end up in the rubbish bin? Instead，we should design products that can be more easily repaired，reused and recycled．
Kamikatsu, a Japanese village，has already gone Zero Waste．The 2，000 villagers compost their leftovers，and recycle everything else．There are 34 different boxes at the re-cycling centre! Residents grumble about the inconvenience，but they also see the benefits．
People who live Zero Waste lives are careful about what they do．They never take more than they need．Reusing plastic bags at supermarkets is a great way to reduce waste．And those who plan before they shop avoid having to throw food out later．Also，it’s best not to go food shopping when you’re hungry：You’ll be sure to buy too much!
Let’s think about how to enjoy a Zero Waste Christmas．By sending recyclable cards，we can help our friends and family reduce waste．And what better way to enjoy the spirit of Christmas than with a real tree that can be replanted in the spring?
Going Zero Waste requires us to think more about what happens before and after we act．It takes ambition，and it's not always easy．But just think how good it would be，both for ourselves and for the environment, if we never had to waste anything．
【小题1】When is this passage probably written?

B
When people lose legs after accidents or illnesses, emergency care and artificial limbs（假肢）often allow them to walk again. Newts （蝾螈） in the same situation, on the other hand, can grow limbs back on their own! Scientists have known for a long time that certain animals can re-grow limbs, but they haven’t quite figured out how these creatures do it.
Researchers have now come up with some new ideas. Their work may give people the ability to re-grow lost limbs. The researchers started with two simple experiments：when you cut a newt’s leg at the ankle, only the foot grows back；when you cut off a leg at the very end, the whole leg grows back. In both cases, the re-growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.
How do a newt’s stem cells know when to grow only a foot and when to re-grow a whole leg?
This question relates to another mystery. In newt’s, a cut-off leg will grow back only if the nerve bundle（神经束）in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re-grow a new leg.
In its study, a British team focused on a protein called n-AG. When the team prevented nerves in a limb from growing, but added the n-AG protein to stem cells in the limb, the limb still re-grew. That protein seems to guide limb re-growth. People have proteins that are similar to n-AG. Further research into these materials may someday help human limbs recover by themselves.
40. In the experiments, the researchers cut off a newt’s foot or leg to find out _____.
A. what stem cells were                     B. whether they would grow back
C. how long it would take to re-grow    D. how they would re-grow
41. A newt will re-grow its leg if _____.
A. its ankle was cut off but the nerve bundle was good
B. its leg was cut off and the nerve bundle stopped growing
C. its leg was cut off and the nerve bundle could grow back
D. its ankle and the nerve bundle were cut off
42. What do the underlined words “these materials” refer to?
A. Nerve bundles and proteins.         B. Proteins similar to n-AG.
C. Stem cells and proteins.               D. Stem cells and nerve bundles.
43. The first sentence of the passage _____.
A. acts as a lead–in                       B. shows where researchers got their new ideas
C. states the author’s opinion           D. describes the result of researchers’ studies

 “In only six days I lost seven pounds of weight.”

 “Two full inches in the first three days!”

These are the kinds of statements used in magazine, newspaper, radio and television ads, promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs, slim the face, smooth wrinkles, or in some other way to beauty or desirability.  

Often such products are nothing more than money-making things for their promoter. The re they produce are questionable, and some are dangerous to health.  

To understand how these products can be legally promoted to the public, it is necessary? Understand something of the laws covering their regulation. If the product is a drug, FDA（Food Drug Administration）can require proof （证明）under the Food, Drug, and Cosmetic Act that safe and effective before it is put on the market . But if the product is a device, FDA. has no author to require premarketing proof of safety or effectiveness. If a product already on the marker danger to health, FDA. can request the producer or distributor to remove it from the a voluntarily, or it can take legal action ,including seizure （查封） of the product.  

One notable case a few years ago involved an electrical device called the Relaxacisor, had been sold for reducing the waistline. The Relaxacisor produced electrical shocks to the ## through contact pads. FDA. took legal action against the distributor to stop the sale of the ## the grounds that it was dangerous to health and life.  

Olwionsly, most of the devices on the maker never been the subject of court proceedings （法律诉讼）,and new devices appear continually, Before buying, it is up to the consumer to the safety or effectiveness of such items.  

1.It can be inferred that ads mentioned in the text are ______.  

A. objective          B. costly         C. unreliable          D. illegal  

2.Which of the following is true according to the text?

A. The court is in charge of removing dangerous product.  

B. New products are more likely to be questionable.  

C. The production of a device must be approved by FDA.  

D. The promoters usually just care about profits.  

3.FDA. can ask for the proof of safety and effectiveness of a product ________.  

A. if it is a drug

B. if it is a device

C. if its consumers make complaints

D. if its distributors challenge FDA’s authority  

4.The Relaxacisor is mentioned as_______.  

A. a product which was designed to produce electricity

B. a product whose distributor was involved in a legal case

C. a successful advertisement of a beauty product

D. an example of a quality beauty product  

5.The author intends to __________

A. make consumers aware of the promoters’ false promises

B. show the weakness of the law on product safety

C. give advice on how to keep young and beautiful

D. introduce the organization of FDA. 

When people lose legs after accidents or illnesses, emergency care and artificial limbs（假肢）often allow them to walk again. Newts （蝾螈） in the same situation, on the other hand, can grow limbs back on their own! Scientists have known for a long time that certain animals can re-grow limbs, but they haven’t quite figured out how these creatures do it.

Researchers have now come up with some new ideas. Their work may give people the ability to re-grow lost limbs. The researchers started with two simple experiments：when you cut a newt’s leg at the ankle, only the foot grows back；when you cut off a leg at the very end, the whole leg grows back. In both cases, the re-growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.

How do a newt’s stem cells know when to grow only a foot and when to re-grow a whole leg?

This question relates to another mystery. In newt’s, a cut-off leg will grow back only if the nerve bundle（神经束）in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re-grow a new leg.

In its study, a British team focused on a protein called n-AG. When the team prevented nerves in a limb from growing, but added the n-AG protein to stem cells in the limb, the limb still re-grew. That protein seems to guide limb re-growth. People have proteins that are similar to n-AG. Further research into these materials may someday help human limbs recover by themselves.

40. In the experiments, the researchers cut off a newt’s foot or leg to find out _____.

A. what stem cells were                    B. whether they would grow back

C. how long it would take to re-grow    D. how they would re-grow

41. A newt will re-grow its leg if _____.

A. its ankle was cut off but the nerve bundle was good

B. its leg was cut off and the nerve bundle stopped growing

C. its leg was cut off and the nerve bundle could grow back

D. its ankle and the nerve bundle were cut off

42. What do the underlined words “these materials” refer to?

A. Nerve bundles and proteins.         B. Proteins similar to n-AG.

C. Stem cells and proteins.              D. Stem cells and nerve bundles.

43. The first sentence of the passage _____.

A. acts as a lead–in                      B. shows where researchers got their new ideas

C. states the author’s opinion           D. describes the result of researchers’ studies

Grown-ups know that people and objects are solid. At the movies, we know that if we reach out to touch Tom Cruise, all we will feel is air. But does a baby have this understanding?
To see whether babies know objects are solid. T. Bower designed a method for projecting an optical illusion(视觉影像)of a hanging ball. His plan was to first give babies a real ball, one they could be expected to show surprised in their faces and movements, All the 16 to 24-week-old babies tested were surprised when they reached for the illusion and found that the ball was not there.
Grown-ups also have a sense of object permanence. We know that if we put a box in a room and lock the door, the box will still be there when we come back. But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?
Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old. In his experiments, Bower used a toy train that went behind a screen. When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to re-appear. If the experiment took the train off the table and lifted the screen, all the babies seemed surprised not to see the train. This seems to show that all the babies had a sense of object permanence. But the second part of the experiment showed that this was not really the case. The re-searcher substituted(替换) a ball for the train when it went behind the screen. The 22-week-old babies seemed surprised and looked back to the left side for the train. But the 16-week-old babies did not seem to notice the switch(更换).Thus,the 16-week-old babies seemed to have a sense of “something permanence,” while the 22-week-old babies had a sense of object permanence related to a particular object.
【小题1】The passage is mainly about        .