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老吉主編
昨晚六塲賽事半冷門天下
王登平馬房表現佳
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一關,李森策鈎龍大熱門,結果力較之下跑第三
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爆冷脚爲李兄(右)與練馬師鄒供離老弟兵引 李和璧兄之「來歡樂」,週末由鄭仲謀勇勝
1982
中學會考試題預習專欄
地
理
(廿三)
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Geography (23)
Lee
MELL & DALE PRESS LTD.
45. The diagram below
shows the locations of several oilfields in China","
Explain why the locations of
oilfields in area A are more favourable than those in aren H with reference to the
economic development of the area concerned
Dilfield
Suggested Answers:
A
Taching
The oilfields in Area
are located in the well developed industrial region in China. The population of the area is nuch denser than Area B
abundant labour is
easily obtained,
lfields in the area include the Taching, Pohai and Shengli Oilfields. All of them enjoy favourable conditions.
to Peking, Tientsin and
Tsinan, which are major
industrial centres, too.
Oilfields in area B are
表
avay, or the tin-bearing material is carried
through high pressure
water pipe into a palong. or launder where the heavier tin ore sinks behind a series o£ obstructions. The tîn ore is then shovelled out of palong by the
wers.
not so favourable since they are located in the NW part of China, which is remote from the coast. and market. The population density of the area da low, and there. are only a few scattered industrial centres, the The Significances of Tin local demand is thereföre Production in the.... low. Except for Yumen, transportation of oil is difficult since there are only few railways and limited pipeline linkage between oilfields and refineries.
46. Describe two modern.. methods by which tin is mined in Malaysia and account for the significance of tin production in the economic development of Malaysia.
Suggested Answers:
The two modern tin mining methods, employed in Malaysia are:
(1) Dredging
This method is extensively practised ireas of alluvial leposits, e. K. in the
lang valley and Kinta Book alley, In this method,
large machine or dredge, driven by electric power, |19 found floating on
river or large pond, vast quantities of tín-bearing alluvium and gravels are a scooped up by a cliain" of steel buckets. Then the alluvium is conveyed to sorting sheds or slui ceas where the mineral-bearing material is washed over and over again by strong jets of water until the heavier tin ore is separated from the gravel and remains behind. "One of the advantages of this technique is that the deposits with tin contant (as low as 1 can be.
worked. In Malaysia, over half of the tin ore produced is obtained by this method. The initial capital required for setting up a plant for such operations is quite Farge, this method is therefore mainly employed by a few farge mining companies.
The Taching oilfield is si
ituated in Manchuria, the important close to industrial cities such as Harbin, Chengelium, Tsitshishan and Shengyang, The above industrial centres produce a lot of heavy industrial goods, e.g. electric goods, e,g.
electric motors, steam turbins, locomotives, metallurgical equipment and iron and steels, and thus consume a lot oľ petroleum to generate electricity. Transporta- tion of oil is favoured by the dense network of: railways which links the oilfields with refineries and the port Luta, vhere:
sent by ship of Ecan be or tanker to other parts of the country, and for export.
The Pohai and Shengli are located in the N. Shangtung Peùinsula in E. -China. They are close
(2) Hydraulic Gravel
Pumping
It is a method which is extensively employed in areas of thick tin ore deposits near the source of water power, High Pressure monitors direct jets of water against the tin- bearing gravel, which is loosened and swept into a sluice or settling tank where the heavier tin particles settle to the bottom while the lighter impurities are washed
Economic Development of Malaysia.
-Tin mining,
on one hand, has encouraged the
economic development of Malaysia in the following Ways:
(1) The great profit from tin mining encouraged inmigratio
especially the people from South Ching", who helped a lot in the early development of Malaysia.
(2) Mining centres soon
prospered into large towns as the industry. attracted also dany other professions.... Ipoh and Kuala Lumpur serve as very good. examples.
les,
(3) Since tin mining
requires a lot of cheap power, the generation of H.E.P. ate Chenderol Lake- în the Peruk Valley was developed. It in. turn encourages the
industrial
development of the country.
(4) Tin mining has also led to the improve- ment of communica- tion of the country. Highways and, railways are constructed, ports are developed to facilitate the transportation of concentrated tin ore to smelters, and the exportation of refined ingots to other countries, encourages the plantatio agriculture such as the plantation of rubber, coconut oil, palm and pineapples. (5) The export of tân
accounts for a major earning of the country. The money can be used to help the development of the country many different ways, such as in education, industrial develop- ment and social welfare,
tin
On the other hand, mining poses some problems on the economic development of Malaysia.
(1) Tin mining, as many
other mining activities, can be regarded as a
robber
industry for its tailings occupy large areas which may be utilized for
better uses, such as agriculture and forestry.
(2) Tin, together with
rubber, account for about 80% of its total exports. It is. unsafe for Malaysia to be too
concentrated upon these two products.
As the prices of them fluctuate, the
economy of the
country also guffer: from its
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BIOLOGY (23)
W. W. Leung
MILL & DALE PRESS LTD.
Unit 17: Environment 5. The following
organisøs are foun in a pond.
Herbivorous fish
protozoi
2 species
A & B
Tadpoles
Pond weeds
Ducks
A green algae.
One species of protozoa feeds on green algae. The other species of protozoa ist
carnivorous and feeds- on the forner protozoa,
The following are the data about the two species of protozoa.
Weight of
1 million individ ti#Is
Average number of organisma per c.c. of vater
b)
species species
100
B
003gl
(1)Determine which
species of protozoa is carnivorous, and give 2 reasons to
support your answer, (2)It is found that: when tg of the carnivorous species has eaten 1 million of the other. protozoan species, its weight
increases only by 0.0015g. Explain Construct a food web. of the organi sos listed above. (Start
with the producers at
the bottom of your web)
not
Bacteria are listed in the organisms above. (1)Can they be found in the reservoir? (What is the role of
:bacteria in an
ecosystem?
The horizontal axi
the graph below
represents the
distance along a
stream, "X" is the point where some. domestic wastes are added to the stream.
The effect of these
wastes on the oxygen -content and the populations of barteria, algae and fish are shown in the Kraph.
Increase amount
alque Fish
bacteria
Distance downstream (m)
Explain the change or (1) the bacteria
population
the
oxygen
lealgaë population the figh
intent
the change
population
the oxygen content
(5) the algae
population
(4) the fish
population
e) Why do the domestic wastes gradually disappear along the stream?.
Answers:-
S
Producers:
Pond weeds.
Green algae
Primary Consumers
fish
Herbivorous
Tadpoles
Protozoan A
Secondary consumers:
Ducks
Protozoan B
(1)They can be found
in the pond. (2) They act as the
decomposer.
The bacteria
population increases because nutrients. increase when wastes are added to water. (2) The oxygen
the
decreases number of bacteria, and therefore the consumption of oxygen in water increases. The decrease of algae also reduces the Jiberation of oxygen from photosynthesis. (3) The algae population
decreases because the pollutants, in the water reduce the light available to the the algae, and therefore the rate of photosynthesis is
reduced, The decaying Waste may be ⠀ poisonoua to the algae.
(4) The fish population
decreases because there is less oxygen. for the respiration: of the fish. They have less food as the algae decreases, The decaying wastes are poisonous to the fish.
1) (1)Species B is
carnivouous. It is. larger în body size and lesser in snumber than species
A. These indicate that it has a high (1) trophic level.
(2)Species B has eaten
1 million of species A (0,002g) but its weight increases by 0.0015g. It is. because some materials are used in respiration to release energy for vital activities
such as movement of food vacuoles, digestion and absorption.
(2)
bacteria
lation will
decrease.
The oxygen content will increase.
(3) The algae population
will increase.. (4) The fish population'
will increase.
e) The wastes are
decomposed by the bacteria to simpler materials. Some of
these materials are liberated us gases and some are absorbed. by the algae,