You have an SQL query that takes one minute to execute. You use the following code segment

You have an SQL query that takes one minute to execute. You use the following code segment to execute theSQL query asynchronously.Dim ar As IAsyncResult = cmd.BeginExecuteReader()You need to execute a method named DoWork() that takes one second to run while the SQL query is executing.DoWork() must run as many times as possible while the SQL query is executing.Which code segment should you use?（）

A.

B.

C.

D.

You have an SQL query that takes one minute to execute. You use the following code segment to execute theSQL query asynchronously.IAsyncResult ar = cmd.BeginExecuteReader(); You need to execute a method named DoWork() that takes one second to run while the SQL query is executing.DoWork() must run as many times as possible while the SQL query is executing.Which code segment should you use?（）

A.

B.

C.

D.

You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.Dim ar As IAsyncResult = cmd.BeginExecuteReader()You need to execute a method named DoWork() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A. While ar.AsyncWaitHandle Is Nothing DoWork()End Whiledr = cmd.EndExecuteReader(ar)

B. While Not ar.IsCompleted DoWork()End Whiledr = cmd.EndExecuteReader(ar)

C. While T hread.CurrentThread.ThreadState = ThreadState.Running DoWork()End Whiledr = cmd.EndExecuteReader(ar)

D. While Not ar.AsyncWaitHandle.WaitOne() DoWork()End Whiledr = cmd.EndExecuteReader(ar)

听力原文：You have reached the offices of Family Security Systems, the company that takes care of all your insurance needs. We are open from 9:00 to 5:00 Monday through Friday. If this is an emergency, please press 1. An agent is available to assist you immediately 24 hours a day. To speak to someone about an existing policy, press 4. To sign up for a new policy, press 5. To register a change in your mailing address using our automated system, press 6. You may also change your address and check your polcy on our company's website. Please have your policy number and PIN available when logging on to the website. Thank you for calling Family Security Systems.

What kind of place is Family Security Systems?

A．A police station.

B．A travel agency.

C．An insurance company.

D．An alarm installation company.

You are developing a client application that consumes a Windows Communication Foundation (WCF) service. You use the svcutil.exe utility to create a proxy for the service. You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method must be called when the service operation returns.You create an instance of the client proxy with the following code:var client = new TranvelServiceClient();You need to ensure that a callback is received when the GetFlight operation is called asynchronously.Which code segment should you use?（）

A. client.BeginGetFlight(GetFlightCallback, null); client.GetFlight();

B. client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);

C. client.GetFlightCompleted += new EventHandler(GetFlightCallback); client.GetFlightAsync();

D. IAsyncResult asyncResult = client.BeginGetFlight(GetFlightCallback, client); client.EndGetFlight(asyncResult);

You should spend about 40 minutes on this task. Write about the following topic: As children become adults, their social behaviour changes in some ways. What are the main differences between young childrens social behaviour and that of adults? To what extent are the changes that take place good? Give reasons for your answer, and include any relevant examples from your own knowledge or experience. Write at least 250 words.

Part A

Directions: Read the following three texts. Answer the questions on each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1.

In the 1960s, medical researchers Thomas Holmes and Richard Rahe developed a checklist of stressful events. They appreciated the tricky point that any major change can be stressful. Negative events like" serious illness of a family member" were high on the list, but so were some positive life-changing events, like marriage. When you take the Holmes-Rahe test you must remember that the score does not reflect how you deal with stress-it only shows how much you have to deal with. And we now know that the way you handle these events dramatically affects your chances of staying healthy.

By the early 1970s, hundreds of similar studies had followed Holmes and Rahe. And millions of Americans who work and live under stress worried over the reports. Somehow, the research got boiled down to a memorable message. Women's magazines ran headlines like "Stress causes illness!" If you want to stay physically and mentally healthy, the articles said, avoid stressful events.

But such simplistic advice is impossible to follow. Even if stressful events are dangerous, many--like the death of a loved one-are impossible to avoid. Moreover, any warning to avoid all stressful events is a prescription (处方) for staying away from opportunities as well as trouble. Since any change can be stressful, a person who wanted-to be completely free of stress would never marry, have a child, take a new job or move.

The notion that all stress makes you sick also ignores a lot of what we know about people. It assumes we're all vulnerable (脆弱的) and passive in the face of adversity (逆境). But what about human initiative and creativity? Many come through periods of stress with more physical and mental vigor than they had before. We also know that a long time without change or challenge can lead to boredom, and physical and metal strain.

The result of Holmes-Rahe's medical research tells______ .

A．the way you handle major events may cause stress

B．what should be clone to avoid stress

C．what kind of event would cause stress

D．how to cope with sudden changes in life

Sometime when you take a common drug, you may have a side effect. That is, the drug may cause some effect other than its intended one. When these side effects occur, they are called adverse reactions. Whenever you have an adverse reaction, you should stop taking the drug right away. Ask your pharmacist whether he can suggest a drug that will relieve the symptoms but that will not cause the adverse reaction. If an adverse reaction to a drug is serious, consult your doctor for advice at once.

Drugs that are safe in the dosage stated on the label may be very dangerous in large doses. For example, aspirin is seldom thought of as dangerous, but there are many reports of accidental poisoning of young children who swallow too many for their young bodies to handle. In adults, excessive use of some pain-killing drugs may cause severe kidney （肾脏）damage. Some drugs for relief of stomach upsets, when taken in excess, can cause an upset in the body's secretion of enzymes, perhaps causing serious digestive problems. You should never use any over-the-counter drug on a regular, continued basis, or in large quantities, except on your doctor's advice. You could be suffering from a serious illness that needs a doctor's care.

Each drug you take not only acts on the body but may also alter the effect of any other drug you are taking. Sometimes this can cause dangerous or even fatal reactions. For example, aspirin increases the blood-thinning effect of drugs given to patients with heart disease. Therefore, a patient who has been taking such a drug may risk hemorrhage if he uses aspirin whenever he gets a headache. Before using several drugs together you should ask your doctor and follow his advice. Your pharmacist can tell you whether certain drugs can safely be taken together.

Alcohol may increase the effect of a drug. Sleeping pills and antihistamines are two types of drugs that combine with alcohol to produce drowsiness. When taking any drug, you should ask your doctor whether drinking alcohol could be dangerous in combination with medicine.

Experts believe there is a relationship between adult abuse of legitimate medicines and the drug culture that has swept our country. You can do your share to reduce the chances that your children will become part of the drug culture by treating all medicines with respect. Always let your children know that medicines and drugs should not be used carelessly.

What are side effects according to the passage?

A．Withdrawal symptoms.

B．Overdoses.

C．Certain effects other than intended ones.

D．Sidewalk effects.