Blood When you cut yourself, some very small blood vessels break, and a little b lood escapes. Soon the blood clots. It forms a thick jelly that plugs the cut. F rom such experiences we all learn that blood is red, thicker than water, sticky, and salty in taste. If a drop of blood is examined under a microscope, many round cells can be seen. These are the red cells. Seen singly, they appear faint pink or yellow ra ther than red. Only the thickness of many cells bunched together makes blood loo k red. Red cells are only one kind of solid matter that is found in blood. Some o f the solids are dissolved in the watery part. Other solids are in suspension. T hat is, they are distributed through the blood like grains of sand in a glass of water that has been stirred. In laboratories blood can be separated into two ma jor parts: a jelly like mass of cells and a thin, straw colored liquid. The liquid part of the blood is called plasma. It is thin and clear because e it is 90 percent water, but many chemicals are dissolved in it. These chemicals include those which build bones, and those which are needed by the heart and mus cles. Plasma contains salt, which is why blood tastes salty. Plasma also carries sugar and tiny drops of fat — fuels for the body’s cells. Most of the solids d issolved in plasma are proteins. Proteins perform some of the most important job s in the human body. While circulating throughout the body, the blood plasma also carries solid s that are not dissolved. There are three kinds of solid bodies in the blood: red cells, white cells, and platelets. Each performs one major task. The red cells c arry oxygen throughout the body. The platelets help to clot the blood. The white cells attack infection causing bacteria. When harmful organisms infect the body , the total number of white cells may double or triple. One of the ways a doctor can tell whether someone is suffering from some unknown infection is to count t he white cells in a tiny sample of blood.
36、The blood looks red because of the g____of red cells.
37、(同36题)Besides the solid matters dissolved in the watery part, other kinds of solid matters s____in the blood.
38、(同36题)The function of blood lies in the fact that it c____ various nutrition to every part of the whole body.
39、(同36题)The solid bodies in the blood consist of red cells, white cells and p____.
40、When someone is suffering from infection, the number of white cells in his blood will I____
How Does Acupuncture Work? Acupuncture has been practised in China for more than 2,000 years, but I ts (41)____in the Western world is still very(42)____. Several hospitals in the United States are now experimenting(43)____acupuncture (44)____a way of treating pain. An American journalist who stood beside a patient during an operation in Shanghai recently described the45and its effects. To(46)____the patient from feeling pain during the operation, four(47)____were used, each about an inch and a half long. Two needles were inserted under the skin on each side of the patient’s neck. The top of the needles were attached(48)____wires which(49)____a small electrical device. Throughout the operation the patient talked50to those(51)____around him. Insisting that he felt perfectly normal. How does acupuncture work?(52)____s it able to keep a patient from feeling pain? No very(53)____ nswer has been given. But there are(54)____three theories. Some doctors believe that acupuncture(55)_____produces an effect upon the central nervous system. Others believe that acupuncture(56)____a chemical change in the body’s fluids. Still(57)____theory is that the needles make(58)____ an unknown system of energy in the body which travels along certain(59)____under the skin. The true explanation may be one of these or a combination of more than one. Or it may be something entirely(60)____.
41、A.use B.definition C.explanation D. Execution
42、A.another B.the other C.nextD./
43、A.joint B.contact C.Connection D./
44、A.routes B.lines C.ways D./
45、A.easy B.similar C.same D.different
46、A.young B.new C.old D.younger
47、A.at B.on C.with D.To
48、A.like B.by C.for D.as
49、A.process B.Situation C.Symptom D.aspect
50、A.keep B.leave C.put D./
51、A.noodles B.needles C.spites D.pins
52、A.for B.with C.by D.to
53、A.caused B.resulted in C.led to D./
54、A.calmful B.calmly C.calm D. Calmness
55、A.standingB.stood C.stand D./
56、A.where B.what C.whether D.how
57、A.satisfied B.satisfactory C.satisfying D.satisfy
58、A.at least B.at best C.at most D.at any rate
59、A.somewhat B.anyhow C.somehow D.someway
60、A.exposes B.produces C.makes D.takes
答案：
1 B 2 B 3 D 4 A 5 B 6 D 7 B 8 C 9 C 10 B
11 C 12 A 13 B 14 D 15 A 16 B 17 A 18 C 19 B 20 B
21 B 22 C 23 C 24 B 25 D 26 A 27 D 28 C 29 D 30 C
31 D 32 D 33 C 34 A 35 D
36 gathering
37 suspend
38 carries
39 platelets
40 increase
41 A 42 A 43 B 44 A 45 D 46 B 47 C 48 D 49 A 50 A
51 B 52 D 53 C 54 B 55 A 56 D 57 B 58 A 59 C 60 B
