根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
As we all know pollution is getting worse on the earth. Everybody of us has our own duty to protect our earth and we can do our best in our daily life and make a difference. Here are some tips.
★Reuse plastic packages. Throwing away plastic wrappings adds greatly to the amount rubbish.
1      If you take a look around your home you will most likely find a new possible way to reuse the bags.
★Use organic (有机的) cleaners. Organic cleaners have almost no pollutants and are much better for not just the environment but also you and your families. Think about your pets which walk across the floor and then lick their paws __2     .
★ __3    take a look at all your toilets and faucets (水龙头) in the house. If any toilets run much longer than they should, adjust them so they are a bit more efficient. If you have a faucet or sink that drips, fix it . Those little drips can really add up .
★Use energy-efficient bulbs. Energy-efficient bulbs can really help in reducing your electricity payment every single month.     4   Energy-efficient bulbs stay cool requiring very little energy to light.
★___5    Do you live in or near a city and have access to the public transportation system? Try taking the bus or subway a few times per week. This will help in reducing the amount of vehicle pollutants in the air.

For computer users, there is no bigger excitement than tossing out your old PC and upgrading to a newer, faster and cleaner machine. With hardware designers like Intel, pushing newer, faster products every year, and new software requiring even more powerful machines, companies and consumers have little choice but to go along.
But this rapid turnover is having a serious effect on the planet. Producing a personal computer consumes large quantities of natural resources. A recent study by the United Nations estimates the energy required to produce a single new computer is equivalent to nearly two barrels of oil. And that doesn't include the 22 kg of chemicals or the 1,500 kg of water used in the manufacturing process.
In fact, pound for pound（均等地）, the process for making a car is about 500% more efficient than that for making a computer. That doesn't matter so much 20 years ago when personal computers were few and far between, but times have changed. These days, computers are found nearly everywhere and sales continue to grow. The number of PCs in use topped one billion in 2002.
Waste in production is only half the problem. Old computers, especially the monitors, are full of dangerous substances, which need to be carefully recycled. The problem is sure to expand over the coming years as users replace their boxy CRT monitors with LCD flat displays.
Europe now requires that 70% of parts from old computers be recycled, but the study’s authors say that’s also part of the problem. The solution, they insist, is for governments and companies to encourage people to use their computers longer, and upgrade rather than replace. But considering that much of the world’s recent economic growth has come from spending on computers and information technology, that advice may sound like wishful thinking. 
【小题1】What do computer users have to do every few years according to the passage?
A. Push newer, faster products.
B. Produce more powerful machines.
C. Consume large quantities of natural resources.
D. Upgrade to a newer, faster computer.
【小题2】What does the underlined word “that” in paragraph 3 refer to?

阅读理解

　　With inspiration from nature and some help from research at the Massachusetts Institute of Technology, a team led by Carnegie Mellon engineering professor Mettin Sitti built a tiny robot that can walk on water, much like the insects known as water skimmers or Jesus bugs.

　　It's only a prototype, but some researchers imagine the water-skimming robot could have many uses. With a chemical sensor, it could monitor water supplies for toxins; with a camera it could be a spy or an explorer; with a net or a boom, it could skim contaminants off the top of water.

　　Sitti's robot is little more than a half-inch boxy body made from carbon fibers and eight, 2-inch steel-wire legs coated with a water-repelling plastic (technically making it a water spider). The robot can stand on water－it doesn't float－and can skim backward and forward, propelling itself with two legs that act like oars. Sitti said he could build a more complex water-skimming robot within six months.

　　Sitti's robot weighs about a gram, about the same as half a dime. So far, it's also cheap. Sitti estimates the materials in his spartan prototype cost about $10.

1．From the story we can infer that the robot was invented by ________.

[　　]

A．Mettin Sitti

B．Carnegie Mellon

C．a team led by Mettin Sitti

D．a team led by Carnegie Mellon

2．The robot was made to ________.

[　　]

A．catch water spiders

B．amuse children

C．do some possible monitoring of water resources

D．save ships from sinking

3．Which of the following statements is not true?

[　　]

A．The newly-made robots have been in practical use.

B．The robot does not weigh as much as one kilogram.

C．The robot can skim on water.

In the days when an ice cream sundae cost much less, a 10-year-old boy entered a hotel coffee shop and sat at a table. A waitress put a glass of water in front of him. “How much is an ice cream sundae?” “Fifty cents,” replied the waitress. The little boy pulled his hand out of his pocket and studied a number of coins in it. “How much is a dish of plain ice cream?” he required. Some people were now waiting for a table and the waitress was a bit impatient. “Thirty-five cents,” she said rudely. The little boy again counted the coins. “I’ll have the plain ice cream,” he said. The waitress brought the ice cream, put the bill on the table and walked away. The boy finished the ice cream, paid the bill and departed. When the waitress  came back, she began wiping down the table and then swallowed hard at what she saw. There, placed nearly beside the empty dish, were two five-cent coins and five one-cent coins---her tip.

1. In the days , an ice cream is ______________.

   A. dearer than usual                B. as dear as usual

   C. much cheaper than usual          D. as cheap as usual

2.How much money did the boy probably have in his pocket?

A. thirty-five cents.      B. More than fifty cents. 

C. only fifty cents.       D. Less than fifty cents.

3.Why did the little boy have only a dish of plain ice cream?

A．The plain ice cream cost him much less.

B．He enjoyed the cheaper ice cream better.

C．The coins were not enough for an ice cream sundae.

D.  He wanted to save some coins to tip the waitress.

4.We can infer that the waitress might have felt _____ when she got the tip.

A. very surprised.                B. a bit of shame

C. quite pleased                  D. a little worried