1 . Do you know why different animals or pests（害虫） have their special colors? Colors in them seem to be used mainly to protect themselves.
Some birds like eating locusts (蝗虫), but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.
If you study the animal life, you'll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters. This is because they have the colors much like the trees. They can often hide in the trees and catch some other little animals.
Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid when it faces danger. While the liquid spreads over, its enemies cannot find it, and it immediately swims away. So it has lived up to now though it is not strong at all.
1. From the passage we learn that locusts _____.| A．are small animals |
| B．are easily found by birds |
| C．change their colors to protect themselves |
| D．are dangerous to their enemies |
| A．They run away quickly. |
| B．Their colors much like their enemies. |
| C．They have to move quietly. |
| D．They hide themselves by day and appear at night. |
| A．like brown and gray colors. |
| B．live in forests. |
| C．have the colors much like the trees. |
| D．move quietly. |
| A．The Change of Colors for Animals and Pests |
| B．The Main Use of Colors for Animals and Pests |
| C．Colors of Different Animals and Pests |
| D．Some Animals and Pests |
“When our families go to the grocery store looking for safe and healthy foods to feed their kids, the last thing they should have to worry about is poisonous bags.” Schumer said, “A quick investigation will allow everyone to make informed, timely decisions.” Schumer added.
Lead in the bags is not likely to rub off (因摩擦而粘在……上面)on food. But over time, paint on the bags can chip and the bags can wear out. When this happens, lead can be released(释放).
The Tampa Tribune newspaper said certain bags sold at Publix and Winn-Dixie supermarkets had lead levels that were a concern to health officials. The affected bags were found in Florida. But Publix has more than 1,000 stores in Alabama, Florida, Georgia, Sough Carolina and Tennessee. Publix says that all of its bags are under current laws about lead content, but that they have asked the makers of the bags to reduce the lead levels in the product.
The bags with the highest levels of lead had fancy designs and many pictures. Plain reusable bags without decoration were found to contain little lead. Consumers worried about lead levels in reusable bags can change to cloth or string bags. Paper bags are also a good choice, since paper can be recycled(回收).
Since 2007, Publix supermarkets have sold more than 13 million reusable bags. The store says because shoppers have made the change to reusable bags, it has saved more than 1 billion paper and plastics bags.
1. The shopping bags containing high levels of lead ______.
| A．have been reported by a newspaper |
| B．have been stopped by the government |
| C．have stopped people from using reusable bags |
| D．have caused serious health damage to customers |
| A．reusable bags do little harm to kids’ health |
| B．people have shown much concern for the reusable bags |
| C．people will be informed of the facts about the reusable bags |
| D．people should refuse to buy things from supermarkets |
| A．dependable | B．convenient | C．harmful | D．popular |
| A．with colorful designs | B．with fancy pictures |
| C．made of plastic | D．made of paper |
| A．caused Publix a lot of trouble | B．saved Publix much money |
| C．cost Publix plenty of money | D．been proved a wrong decision |
