Twenty years ago, most experts believed that differences in how boys and girls behaved were mainly due to differences in how they were treated by their parents, teachers, and friends．It’s hard to cling to that belief today．Recent research has shown that there are biological differences between boys and girls．Understanding these differences is important in raising and educating children．

    For example, girls are born with more sensitive hearing than boys, and the difference increases as kids grow up．So when a grown man speaks to a girl in what he thinks is a normal voice, she may hear it as yelling．Conversely （反过来）, boys who appear to be inattentive in class may just be sitting too far away too hear the teacher．

    Likewise, girls are better in their expression of feelings．Studies reveal that negative emotions are seated in an area of the brain called the amygdala．Girls develop all early connection between this area and the cerebral cortex （大脑皮层）, enabling them to talk about their feelings．In boys these links develop later．So if you ask a troubled adolescent boy to tell you what his feelings are, he often cannot say much．

    Dr．Sax, an advocate of single-sex education, points out that keeping boys and girls separate in the classroom has yielded striking educational, social, and interpersonal benefits．Therefore, parents and teachers should try to recognize, understand, and make use of the biological differences that make a girl a girl, and a boy a boy．

1．What is the main idea of the passage?

    A．Boys tend to pay less attention in class than girls．

    B．Girls are better than boys in their ability to detect sounds．

    C．Boys and girls behave differently because of biological differences．

    D．Single-sex schools are not good because they keep boys and girls separate．

2．Why do girls express negative feelings better than boys?

    A．Girls are more emotional than boys．

    B．Girls have more brain cells than boys．

    C．The amygdala is located in different areas of the brain for boys and girls．

    D．The links between certain parts of the brain develop earlier in girls than in boys．

3．Which of the following does the author believe?

    A．Girls need more training in communication．

    B．Boys and girls should be educated in different ways．

    C．Parents should pay more attention to boys．

    D．Sex differences should be ignored in education。

4．What does the phase “cling to” in the first paragraph mean?

    A．maintain            B．abandon                  C．evaluate          D．challenge

　　On September 4th of 2004 my American friend Jon Hageseth took me to the airport in La Crosse, Wisconsin to fetch a new suitcase. To show my thanks, I treated him and his wife with a Mexican lunch on the way back. After we enjoyed the delicious food, I paid the bill and went towards the car, but just when everyone was seated, Jon's wife Cathy returned to the restaurant. I felt puzzled. Upon her return, she said,“You were clever not paying the tip, so I had to go back to pay it.”I felt so embarrassed that I lost no time to apologize, explaining that there is no such a practice in China. In fact, I don't take the tipping issue seriously although I am aware of such a practice in the US.

　　Another day in September, I dined with one of my American colleagues at a Buffet Restau rant. On finishing the meal I began searching my wallet for small notes.“What are you doing, Zhao Qi?”my colleague asked.“To pay the tip of course.”My colleague burst into laughter,“You don't have to.” “Why?”I asked and recalled my previous embarrassing experience in the Mexican restaurant. And then she told me that it's unnecessary to pay tips at any kind of self-service restaurants, but we have to pay tips only in restaurants where services are provided. I still did not get a clear picture of this issue. Seeing my puzzlement, she offered me some good advice on the situation I should give the tip.

　　In her opinion, tipping plays an important role in US economy and acts as an unavoidable part of American's daily life. The following are a few facts about tipping taken from various university and market-research studies.

　　1．People eating at restaurants in the US pay about $16 billion a year in tips.

　　2．Waiters and waitresses who wait on tables receive much higher tips than those who don't.

　　3．Waitresses who add a“smile”face to their hills see their tips increase about 5％. Men who do the same watch theirs drop 3％.

　　4．94％of Americans regularly tip when eating out.

　　According to my own experience and those various studies, I may conclude that tipping reflects a kind of good manners and appreciation, not as simple as we imagine.

(1) The underlined word“embarrassed”probably has the same meaning as ________.

[　　]

(2) What difficulty did the writer have in giving tips in America?

[　　]

A．Not making sure how much should be given.

B．Not knowing what occasion she should tip.

C．There isn't such a practice in China.

D．Not willing to offer tips.

(3)From the studies we can know that ________.

[　　]

A．every American tips when having meals out

B．only a small amount of money is spent on tips in America

C．a smile on a waitress' face can increase the tip

D．smiles benefit both waiters and waitresses

　　On September 4th of 2004 my American friend Jon Hageseth took me to the airport in La Crosse, Wisconsin to fetch a new suitcase. To show my thanks, I treated him and his wife with a Mexican lunch on the way back. After we enjoyed the delicious food, I paid the bill and went towards the car, but just when everyone was seated, Jon's wife Cathy returned to the restaurant. I felt puzzled. Upon her return, she said,“You were clever not paying the tip, so I had to go back to pay it.”I felt so embarrassed that I lost no time to apologize, explaining that there is no such a practice in China. In fact, I don't take the tipping issue seriously although I am aware of such a practice in the US.

　　Another day in September, I dined with one of my American colleagues at a Buffet Restau rant. On finishing the meal I began searching my wallet for small notes.“What are you doing, Zhao Qi?”my colleague asked.“To pay the tip of course.”My colleague burst into laughter,“You don't have to.” “Why?”I asked and recalled my previous embarrassing experience in the Mexican restaurant. And then she told me that it's unnecessary to pay tips at any kind of self-service restaurants, but we have to pay tips only in restaurants where services are provided. I still did not get a clear picture of this issue. Seeing my puzzlement, she offered me some good advice on the situation I should give the tip.

　　In her opinion, tipping plays an important role in US economy and acts as an unavoidable part of American's daily life. The following are a few facts about tipping taken from various university and market-research studies.

　　1．People eating at restaurants in the US pay about $16 billion a year in tips.

　　2．Waiters and waitresses who wait on tables receive much higher tips than those who don't.

　　3．Waitresses who add a“smile”face to their hills see their tips increase about 5％. Men who do the same watch theirs drop 3％.

　　4．94％of Americans regularly tip when eating out.

　　According to my own experience and those various studies, I may conclude that tipping reflects a kind of good manners and appreciation, not as simple as we imagine.

(1) The underlined word“embarrassed”probably has the same meaning as ________.

[　　]

(2) What difficulty did the writer have in giving tips in America?

[　　]

A．Not making sure how much should be given.

B．Not knowing what occasion she should tip.

C．There isn't such a practice in China.

D．Not willing to offer tips.

(3)From the studies we can know that ________.

[　　]

A．every American tips when having meals out

B．only a small amount of money is spent on tips in America

C．a smile on a waitress' face can increase the tip

D．smiles benefit both waiters and waitresses