雅思阅读真题+题目+答案：What’s in Blood?

雅思阅读真题+题目+答案：What’s in Blood?

A.

Blood is the most specialised fluid within living animals, playing an absolutely critical role. It symbolises life (‘new blood’), health (‘get your blood running’), personality (‘good or bad blood’), and family (‘your bloodline’). This red fluid itself is something which most people would rather not see, yet it contains such a complex soup of proteins, sugars, ions, hormones, gases, and basic cellular components that it is certainly worth considering in some detail.

B.

By volume, half of blood is the liquid part, called plasma. The rest comprises specialised components, the main one being red blood cells (technically known as erythrocytes). These transport oxygen molecules throughout the body, and also give blood its colour (from the hemoglobin protein within, which turns red when combined with oxygen). Red blood cells, as with all cells in the human body, have a limited operating life. They are produced within the marrow of bones, principally the larger ones, and live for about four months before they fall inactive, to be then reabsorbed by the spleen and liver, with waste products absorbed into the urine.

C.

This contrasts with the other main cells of human blood: the white blood cells, technically known as leukocytes. Similarly produced in the bone marrow, they are active only for three or four days, yet they are essential in defending the body against infections. White blood cells come in many different types, each designed to deal with a different sort of invader bacteria, virus, fungus, or parasite. When one of these enters the body, the white blood cells quickly determine its nature, then, after mustering sufficient numbers of a specific type (the period in which you are sick), they launch themselves into the fight, enveloping each individual invasive cell, and breaking it down (leading to recovery).

D.

That leaves the last main component of blood: platelets. Their technical name is thrombocytes, and they are much smaller than red and white blood cells. Also circulating freely, they are responsible for clotting the blood, and this is necessary to heal both external and internal injuries. Again, they are produced in the bone marrow, and have the interesting ability to change shape. There are several diseases related to the breakdown in the regulation of their numbers. If too low, excessive bleeding can occur, yet if too high, internal clotting may result, causing potentially catastrophic blockages in parts of the body and medical ailments we know as strokes, heart attacks, and embolisms.

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Questions 27-33

Reading Passage Three has eight paragraphs, A-H.

Choose the correct heading for Paragraphs B-H from the list of headings.

Write the correct number, i-x, for each answer.

List of headings

i  Not as big, but needing just enough

ii Some attitudes to blood

iii Good, but not so quick

iv Two ideas see a wrong conclusion

v  Complicated identification

vi An interesting treatment

vii A shorter life, but just as important

viii The Principal part that adds some colour

ix Bone marrow and blood

x  Maintaining supplies

Example：Paragraph        AAnswer：ii

Paragraph B    27 __________

Paragraph C    28 __________

Paragraph D    29 __________

Paragraph E    30 __________

Paragraph F    31__________

Paragraph G    32__________

Paragraph H    33__________

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