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对偶价格大于0表明，约束条件常数项开始增加时最优目标函数值必然会得到改进。
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Task 5 Direction:Read the following passage. After reading it, you are required to complete the answers that follow the questions (No. 58 to No. 62).You should write your answers (in no more than 3 words) on the Answer Sheet correspondingly.At all Greenwell General Hospital locations, visitors and visiting hours will be decided by the patient and health care team prior to any visit.There may be times when visitors are restricted to two at a time to respect other patients’ needs or for safety reasons.Visiting critically ill patients (危重症患者)Immediate family members may visit critically ill patients at any time.Children wishing to visitChildren under the age of 12 who wish to visit a patient must be accompanied (陪同) by an adult.Visiting patients in the operating roomPatients in the operating room and day surgery (日间手术) may only have one visitor.Do not visit if you are sickIf you’re experiencing any of the symptoms (症状) of illness like cough and fever, please do not visit the hospital.If you’re a patient and you’re experiencing these symptoms, tell a member of your care team right away.58. Who will decide visitors and visiting hours at the hospital ‘s locations?The patient and ______________________.59. Why is there a limit of two visitors for one patient at a time?To respect other patients’ needs or for _____________________.60. What kind of patients may immediate family members visit at any time?______________________________.61. What should children under the age of 12 do if they wish to visit a patient?They must be accompanied by ________________.62. Whom should a patient tell if he or she is experiencing the symptoms of illness like cough and fever?Tell a member of the __________________________ at once.
Task 2 Choose the best answer to complete each of the following sentences.1. __________ at in this way, the present economic situation doesn't seem so gloomy.
2. There _________ nothing more for discussion, the meeting came to an end half an hour earlier.
3. Time ________ , the celebration will be held as scheduled.
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