单项选择题 The doctor couldn’t explain the （）of the high temperature.

单项选择题 It has been believed that cowboys（）a simpler way of life and freedom without restraint.

单项选择题 The doctor asked her assistants to keep her（）of the patient’s physicalcondition after surgery.

单项选择题 It doesn’t make any difference to me（）.

单项选择题 Her project（）good and reasonable.