There are three main groups of oils: animal, vegetable and mineral.0 _9 `7 n8 }3 f$ ]' r1 v
Great numbers of animal oil come from whales, those enormous __1__
: d1 Z8 R) I' _ creatures of the sea which are the largest remaining animals in the
* ~) D4 d. K! e. e world. To protect the whale from the cold of the Arctic seas, nature
# z! p i3 }" ]" @8 m0 `1 g has provided it with a thick cover of fat called blubber. When the __2__% E1 T: O% U' r1 `" A
whale is killed, the blubber is stripped off and boiled down, either0 Z) ]& y5 y7 r R* Q3 T+ L
board the ship or on shore. It produces a great quantity of oil which __3__6 s5 n' }+ e( s7 W+ W6 G
can be made into food for human consumption. A few other creatures6 x6 E2 Z6 [2 \) H
yield oil, and none so much as the whale. The livers of the cod and __4__
+ w( @) P* T% \+ T" o6 c the halibut, two kinds of fish, yield nourishing oil.
8 Y; ? L9 c' B# Y p: y7 j+ z% p* Q Both cod liver oil and halibut liver oil are given to sick children" D$ ~4 I9 i1 E0 r
and other invalids who need certain vitamins. These oils may be
5 Y+ }( C0 Q5 q bought at any chemist. Vegetable oil has been known from antiquity. __5__* a# G, V3 K( f) i+ H3 R
No household can not get on without it, for it is used in cooking. To __6__, i6 {' {" c; L o# k- z
the ordinary man, one kind of oil may be as important as another.
& Y2 f, x) Z1 z# j( I" B! [ But when the politician or the engineer refers to oil, one almost always __7__
8 B* v8 z- D5 q$ Y% N means mineral oil, the oil that drives tanks, aeroplanes and warships,
2 J4 ^0 D9 F7 U- p7 ?4 M8 h1 z motor-cars and diesel locomotives; the oil that is used to lubricate; u, _' a! A4 a$ Z w4 e
all kinds of machineries. This is the oil that has changed the life __8__+ ~& t% X; i. f, _1 `+ t1 }
of the common men. To it we owe the existence of the motor-car, __9__ h9 `# B& V% ~7 R2 m2 ^
which has replaced the private horse-drawing carriage. __10__ |
发表于 2012-8-14 11:29:10
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