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署首席督學白宇達(左)及何換賢合
「殘人士指導泳術,深獲好評,伊與教
|游泳教林柏格非太太來港任教,向傷
教育司康體組最近從英聘著名
、黃沛然、胡文禮等剪
許周美麗、容應標、夏振政、楊植秋 南區民政區本體處辦籃球揭幕
海天體育會昨晚歡
送香港水珙代爱融及女
.隣景流、曾昭松等及全. 運,談會首長玉華生、
·祗選手碎料塞·參加亞
油尖區四屆田徑賽
十三項大會新
1979
中學會考試題預習專欄
朗德出版魁蘂永蔽提供資料
生物
BIOLOGY (9)
mit Fives.
Homeostasis.
CA)
1. The disease diabetes mellitus
is due to an abnormal secre- tion of insulin. A person with suspected diabetes is often asked to eat and drink nothing for 12 hours and then drink 50 grammes glucose in water. After the drink the glucose level is measured. every 30 minutes for 6 hours and then an injection of insulin is given.
The following graph shows the results of a patient with suspected diabetes mellitus and that of normal people.
blood glucose level
(mg/100ml) K
500
400
$300
200
100
Ο
the patient
normal people
Time (hours)8 9
a. glucose drink
an injection of insulin
What is the reason for not allowing the patient any food or drink for 12 hours. before the test?
From the graph,
(1) what is the effect of
glucose drink on the blood glucose level? (2) what is the effect of
insulin on the blood. glucose level? c) Do you think that the
a)
patient is suffering from diabetes ? Give three reasons to support your answer.
Describe and explain the curve which illustrate the results of normal peorle.
The table below shows the percentage of heat loss of a naked body by different processes at 21°C and XO C
of heat loss at 219cjat x°c
70%
Body heat lost by
Radiation &
0%
conduction
Vaporization,
of sweat
279
Respiration
2%
·93"
7%
Urination &
defecation:
196
0%
a)
What is the temperature X?
b) Give reasons for your
answer in (a),
c) suggest the main process by which body beat is
lost at 10°C. Lost at
d) Give two methods by which
the body achieves
(1) a higher rate of heat
production in cold. weather.
(2) a lower rate of heat
productior in hot weather.
jane a process carrie)
out in plants, which has
a cooling effect similar to sweating.
Give two advantages of keeping nomoiothermy.
3. The following diagram is
vertical section through. the skin of a mammal.
Which two of the numbers indicate structures Which are mostly concerned vith reducing the temperature of the body when it becomes overheated.
Describe briefly the way in which the structures in (a) help to reduce the body temperature.
why it is difficult
Iom to live in a situa-
tion which is both hot and hu-id.
Answers:
1a) To maintain the blood glu-
cose at a steady level so that any changes in blood glucose level during the test can be detected more
b)(1) An increase in lood plu-
cose level.
(2) A decrease in blood
cose level.
c) Yes
The blood glucose level of the patient is compa- ratively high.
The blood glucose level of the patient increases rigerously after the glucose drink.
The increased blood gl cose level after the glucose drink continues for a longer time.
(a) The blood glucose of normal people increases after a glucose drink. The blood glucose increases because glucose in the alimentary canal diffuses into the blood. About an hour later, the increase of blood glu- cose ceases and the level goes down to a steady normal ctate. It is because an increase in blood glucose promotes the secretion of insulin which stimulates the conversion of glucose to glycogen for storage in liver. The normal blood glucose level drops after an injection of additional insulin.
2.a) Body temperature ( 36,9°C) b) When the environmental tem- perature is equal to the body temperature, the net heat loss by radiation and
conduction as well as by urination and defecation would become zero.
c) Radiation and conduction. d) £nivering and increased
metabolic activities.
(2) Inertia and decreased metabolic activities.
Transpiration.
(1) The temperature-depen
dent metabolic activi-. ties can be maintained at the most efficient. rate.“
(2) The animals remain ac-
tive in both hot and cold enviroments. 3.3(sweat gland), and 2. a) (blood vessels)
b) The sweat gland secretes sweat which passes up the sweat duct onto the surface of the skin. As the sweat evaporátes it takes latent heat from the body and this helps to reduce the body temperature. The surface blood vessels dilate, so more clood flows to the surface and heat is lost to the atmosphere by radiation and convection. ) Because it is difficult to
control the body tempera- ture. The body temperature can be increased, particu- larly by absorbing foo much radiation from the sun, and at the same time loss of heat from the body into the atmosphere by radiation is. prevented or reduced. In hunid conditions the air already holds much water vavour and may be saturated, as s a result, evaporation of sweat from the surface of the body is reduced or prevented and the body. temperature cannot be lower- ed by this method.
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理 (九) GEOGRAPHY (9)
#b
Suggested Answers:
IMPORTANCE AND CHARACTER- ISTICS OF DAIRY FARMING IN NEW ZEALAND
1) Dairy cattle rearing is an important agricultural activi ty of New Zealand, New Zea- land is the world's biggest and most efficient exporter. of dairy products. The industry has developed on account of fe increasing demands from cities for milk, cream, butter, and cheese.
2) The dairy industry in New Fealand contributes almost third of the total export value of the
country.
3) Dairying in New Zealand is solely on a commercial scate.
4) about 15% of New Zealand farms are found in North: Island, on the SW and - NE lowlands.
5) The size of an average dairy farm is about 60 - 80′ hec- tares, and grazes a dairy herd of around 100 cattle. However, since the past 15′′
years
The
brena nas Deen
changing in favour of large farms.
6) The main breed of cattle is the Jersey which is noted for the high yield of butter. fat in the milk, but the Friesian is going in popular- ity because of the current ⠀⠀⠀ trend in dairy farming awards combining dairy production. with beef production.
7) The operation of the firm is highly mechanised, with electric fances, elde tric milking machines and highly automated milking sheds and collecting yards.
8) The industry is organised along highly efficient coop- erative lines, The farmers. within a particular area have" their milk collected daily by tuakers to the dairy factories where milk is tested, past- eurised and processed.
FAVOURABLE CONDITIONS. LEADING TO THE SUCCESS
PHYSICAL CONDITIONS »
1) New Zealand enjoys- warm temperate oceanic climate. Winters are mild which pernit out-door grazing throughout the year.
2) The mild, moist climate and fertilized soil allow the growth of excellent grass and hay crops like alfalfa,
3) It has cool summer tempera- tures, Dairy cattle give much milk in cool summers and milk
can be kept for a longer period.
4) It has low rolling and
humid plains.
BULAN FACTURS:
1) There are good road networke to connect the chief pastoral sresa - the Waikai to Valley “Taranki Lowlands and Hawke's Bay – to the main population centres, e.g. Heamilton, Auckland and Wallington.
2) Oversea markets are also favourable. New Zealand used to to get a preferential turiff from the United Kingdom. Though this contract had ended recently, sales to SE Asian countries are still optimistic.
3) The invention of refrigera-. tion enables the dairy products to be exported over long diɛ- tnace without going bad,
4) The early settlers are hard- working and open-minded, they are eager to seek new ideas, try out new techniques and carry out researches.
5) Pastures are improved by using superphosphate, Quality of dairy products is raised by introducing better breeding of cattle, e.g. crossed breed of the Jersey and Friesian.
6) The innovation of milk tank- er makes transportation of milk officient. It has encour- aged the growth of multi-plante and multi-production companies (which process butter, cheese, and milk powder all under one roof) and at the same time,
lowers the cost of production,
There are organized co-
operatives to market the dairy products.
8) The dairy industry 18. greatly aided by the New Zea- land Dairy Board, too. The Board is responsible for the co-ordination of dairy process- ing and marketing. It helps to inspect the products care- fully and guarantees the quality. It also carries out researches so a to provide technical services and advices.
Question for next week:
Rubber growers in wes tern Malaysia are facing with increasing difficulties Nr. Brown, an owner of a“. rubber planation along the western foothills, said in a recent. interview:
"In the past, I planted rubber in all my fields, but now I plant it on only 65 of the land. I grow other cash crops on the mat of my land."
POTE
·Sirettenham
Land over 400 M.
Rubber Plantation
wave Railway
R
Singapore
SKETCH SECTION OF AB
TEMP
130°C
25
2410
JF MAMI FA SOND CUMATIC GRAPH OF KUALA LUMPUR.
With reference to the above diagrams 1
give an account of the favourable conditions which used to encourage Mr. Brown and other plantation owners to grow rubber as a major cash crop in the western foothills of the Malay Peninsular.
b. Explain why they have to diversify their crops.