阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为规定段每段选择1个正确的小标题；(2)第27—30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。
Surgery is the branch of medicine that deals with the treatment of
disease, deformities, or injuries by operations. The doctor who performs the
operation is called a surgeon. Every physician has some training in surgery and
is qualified to perform simple operations. But surgeons are specially trained so
that they have the judgment and skill to perform complicated operations. 2.
Modern surgery stresses accurate diagnosis of the disease and
proper care of the patient before and after the operation. Thus, the surgeon not
only needs to know how to perform an operation, but also must have a wide
knowledge of anatomy, physiology, chemistry, and pathology. Five to eight years
of training after medical school are necessary for physicians to qualify as
surgeons. 3. A surgical operation is complicated. Many people,
medicines, equipment, and techniques help assure the greatest possible safety
and comfort for the patient. The elimination of pain, the prevention of
infection, and advanced means of diagnosis are all part of modern surgery. A
qualified surgical team is essential to the success of both the operation and
the patient’ s recovery. This team usually consists of a surgeon, at least one
assistant, an anesthesiologist, and one or more nurses. 4. A
surgeon uses many instruments in the course of an operation. These instruments
include holders for needles and sponges, clamps to close off blood vessels, and
retractors to hold back folds of skin. Sharp instruments include scissors and
scalpels. Since the 1970’ s, lasers have been used to make delicate cuts in body
tissues. Doctors use the high- energy light of the laser to cut tissue by
burning fine lines in the skin or other organs. 5. A surgeon can
remove a long section of diseased intestine and sew the remaining intestinal
sections together. The body will function normally after the operation. A
kidney, or even a major part of the stomach, can be removed by an operation. In
heart surgery, a doctor may replace one of the heart valves with an artificial
one. Extensive surgery on the lungs and ribs is often part of the treatment of
cancer. Sometimes an en- tire diseased lung is removed. A neurosurgeon can
remove brain tumors and repair head injuries. Transplanting organs involves
taking a healthy organ from one person and using it to replace the diseased
organ in another person. The kidney is a commonly transplant- ed organ. The
transplanted tissue must closely match that of the patient, or the patient’ s
body will reject the new organ. 6. In microsurgery, the surgeon
operates while viewing the procedure through a microscope or magnifying glass.
This technique enables physicians to perform operations on some of the tiniest
body structures. For example, surgeons can rejoin extremely small blood vessels
and nerves by using this technique. Such surgery has led to the successful
reattachment of severed fingers, hands, and even arms and legs. Doctors also use
micro- surgery to operate on the delicate structures in the eye, the kidney, the
brain, and many other parts of the body. Paragraph 2 ______