假设你是星光中学的李华，将参加主题为"Let's Ride Bicycles"的英语演讲比赛。请撰写一份演讲稿，主要内容包括：
　　1．目前汽车带来的空气污染和交通堵塞等问题；
2．骑自行车的益处：至少三点
　　参考词汇：低碳生活（low-carbon life）；节能（energy saving）
注意：1．词数：120词左右；　2．演讲稿开头和结尾已给出
Good morning, everyone,
I am Li Hua from Xingguang Middle School． The topic of my speech is "Let's Ride Bicycles"．
_______________________________________________________________________________
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_____Thank you!

For as long as humans have lived on the earth, they have made use of various forms of communication. Generally, this expression of thoughts and feelings has been in the form of oral speech. When there is a spoken language problem, communication can be carried out through sign language, in which gestures stand for letters, words, and ideas. Tourists and people unable to hear or speak have often had to turn to this form of expression. When gestures describe words or ideas, they can often be used internationally. When used for spelling words however, where each gesture stands for a single letter, people must share the same written language.

Body language sends ideas or thoughts by certain actions, either meaningfully or not. A wink can be a way of showing that the person is only joking. A nod means agreement, while shaking the head indicates disagreement.

Other forms of language can be found in Braille (a reading system of raised dots read with the fingertips used by the blind), signal flags, Morse code, and smoke signals. Road maps and picture signs also guide and warn people. While language is the most common form of communication, other systems and techniques also express human thoughts and feelings.

1. What does the author mainly want to say?　　　

A. People can communicate in many different ways.

B. Everybody uses only one form of communication.

C. Language is invaluable to foreigners.

D. Non-spoken communication is of little value.

2. According to the text, which part of the body can be used to show you are joking?

A. Fingers.　　　 B. Eyes.　　　　 C. Head.　　　　　 D. Feet.

3. What can’t be effectively communicated by sign language when people belong to different language groups?

A. Spelling.　　　　　 B. Idea.　　　 C. Whole words.　　　　 D. Expressions.

4. How many different forms of communication are mentioned in the text?

A. Three.　　　 　　 B. Five.　　　 　　 C. Six.　　　　　　　　 　 D. Nine.　

There are two types of twins; identical and non-identical twins. Identical twins are formed from a single egg in mother’s body which divides to from two separate babies. Identical twins look the same, and are often dressed by their parents in clothes of the same colors. It is often difficult to tell identical twins from each other, even when they are standing side by side. Non-identical twins come into being when the mother produces two separated eggs a the same time, both of which grow to form babies. In this case the twins look like normal brothers and sisters and are easy to tell one from the other.
　　In the 1970s and 1980s a scientist did some research into twins. He invited many pairs of identical twins to university and asked them to take part in a week of tests. He was particularly interested in adopted (收养) twins who had been separated at birth. He would give the twins different kinds of tests to study their speed of thinking, their speech, their memory, the ways they saw and heard different things, and so on. Time and time again he found separated twins who preferred clothes of the same color, used the same kind of shaving soap, wore the same shaped square glasses and the same colored socks.
　　There is a third type of twins, but it is a very unusual one. Twins which are joined together at birth are known in western countries as Siamese twins.
【小题1】It is difficult to tell identical twins apart because _______.

Decision-making under Stress

　　A new review based on a research shows that acute stress affects the way the brain considers the advantages and disadvantages, causing it to focus on pleasure and ignore the possible negative (负面的) consequences of a decision.

　　The research suggests that stress may change the way people make choices in predictable ways.

　　“Stress affects how people learn,” says Professor Mara Mather. “People learn better about positive than negative outcomes under stress.”

　　For example, two recent studies looked at how people learned to connect images(影像) with either rewards or punishments. In one experiment, some of the participants were first stressed by having to give a speech and do difficult math problems in front of an audience; in the other, some were stressed by having to keep their hands in ice water. In both cases, the stressed participants remembered the rewarded material more accurately and the punished material less accurately than those who hadn’t gone through the stress.

　　This phenomenon is likely not surprising to anyone who has tried to resist eating cookies or smoking a cigarette while under stress –at those moments, only the pleasure associated with such activities comes to mind. But the findings further suggest that stress may bring about a double effect. Not only are rewarding experiences remembered better, but negative consequences are also easily recalled.

　　The research also found that stress appears to affect decision-making differently in men and women. While both men and women tend to focus on rewards and less on consequences under stress, their responses to risk turn out to be different.

　　Men who had been stressed by the cold-water task tended to take more risks in the experiment while women responded in the opposite way. In stressful situations in which risk-taking can pay off big, men may tend to do better, when caution weighs more, however, women will win.

　　This tendency to slow down and become more cautious when decisions are risky might also help explain why women are less likely to become addicted than men: they may more often avoid making the risky choices that eventually harden into addiction.

1.We can learn from the passage that people under pressure tend to ______.

A．keep rewards better in their memory

B．recall consequences more effortlessly

C．make risky decisions more frequently

D．learn a subject more effectively

2.According to the research, stress affects people most probably in their ______.

A．ways of making choices                   B．preference for pleasure

C．tolerance of punishments                 D．responses to suggestions

3.The research has proved that in a stressful situation, ______.

A．women find it easier to fall into certain habits

B．men have a greater tendency to slow down

C．women focus more on outcomes

D．men are more likely to take risks

It gives me great pleasure today to say a few words in praise of a man we will all miss very much. To be honest, I can't imagine we will do without him when he's gone.
　　Bill Masters almost single-handed built up our sales force in the Houston area and developed the market position that we enjoy today. In only six years, he has brought the firm from a very low fifth position in the area sales to the point where we now outsell all but one of our competitors. Not only have we got 37 per cent of the market under Bill's leadership; we are increasing our share with each passing month.
　　As you know, the company has moved Bill to northern California to work his sales magic in one of this company's most competitive(竞争的) areas. But we know that if anyone can do it, Bill Masters can, and I know you all join me in wishing him the best of luck in his new work.
【小题1】The speech was made _______.