4 . 听下面一段较长对话，回答以下小题。
1. When did David come back last night?

A．At 6:00 pm.

B．At 7:00 pm.

C．At 8:30 pm.

2. Why did David go out last night?

A．To watch a movie.

B．To read in a library.

C．To have some discussions.

3. What does David suggest the woman do?

A．Apply to work for the club.

B．Contact Lucy for more information.

C．Learn more about the neighborhood.

5 . 听下面一段较长对话，回答以下小题。
1. What are they talking about?

A．Their favorite subjects.

B．Their performance in class.

C．Their preparation for the coming exam.

2. How does the woman feel about organic chemistry?

A．It is beyond her ability.

B．It is difficult to understand.

C．It has too much to memorize.

3. According to the man, what is a good way to improve English reading comprehension?

A．Practising a lot.

B．Understanding the rules.

C．Memorizing more words.

9 . It’s no secret that sleep is important to your overall health, but a lack of sleep could have great effects on your heart, a new study shows. The researchers said people with insomnia(失眠症)are more likely to have a heart attack.

Insomnia is the most common sleep disorder in the US, the researchers wrote in their report, noting that 10% to 15% of people in the US struggle with it. The meta-analysis of previously published research suggests that the potential association between insomnia and heart attack risk is strongest in women.

Dr. Martha Gulati, director of prevention at the Cedars-Sinai Smidt Heart Institute, said that most of her patients are women and that insomnia is a noted risk factor for women who have had any form of ischemic heart disease. “We see it probably in 1 in 10 patients in the United States,” said Gulati, who was not involved in the new research. “It is my impression that almost everyone experiences insomnia at some point in their life. The estimate is that 1 in 2 adults experience it at some point in their life, maybe in the short term because of stressful moments.”

For their analysis, the researchers defined insomnia as a sleep disorder with three main symptoms(症状): Difficulty falling asleep, difficulty staying asleep and waking early and being unable to fall back asleep.

The study also found an association between increased heart attack risk and how long a participant slept each night. Those who slept five hours or less had the highest association with heart attack risk and were 1.56 times more likely to have a heart attack than people who slept seven or eight hours. Longer sleep duration wasn’t always more protective. The study found that people who slept six hours a night had a lower risk of a heart attack than those who slept nine hours or more. “A lot of studies have pointed somewhere between seven and eight hours of sleep being the magic number for us,” another researcher said. “There is obviously variability for everyone, but too much sleep is rarely the issue.”

1. What’s the function of the first paragraph?

A．To list a fact.	B．To warn the readers.
C．To introduce the topic.	D．To draw the readers’ interest.

2. What can we infer from Gulati words?

A．Insomnia is unavoidable in the short term.

B．Insomnia is a common phenomenon in life.

C．Heart attack often happens during insomnia.

D．Women are less experienced in dealing with insomnia.

3. What inspiration can we get according to the sleeping time?

A．Put quality before quantity.	B．Too much is as bad as too little.
C．Bite off more than one can chew.	D．Hope for the best, but prepare for the worst.

4. What’s the author’s attitude to the relationship between insomnia and heart attack?

A．Pessimistic.

B．Indifferent.

C．Objective.

D．Positive.