7.
Which of the following is true?
A. Although the nuclear
family developed before the extended family, the latter is gaining more and
more popularity everywhere in the world.
B. the most important reason
why people are leaving villages is that they do not enjoy living together with
their parents or grandparents.
C. Different types of
families have developed as different ways of life are accepted.
D. Families change because
tides and fashions always change.
C
In 1957 a doctor in Singapore noticed that hospitals
were treating an unusual number of influenza-like cases. Influenza is sometimes
called ‘flu’ or a ‘bad cold’. He took samples from the throats of patients and
in his hospital was able to find the virus of this influenza.
There were three main types
of the influenza virus. The most important of these are type A and B, each of
them having several subgroups. With the instruments at the hospital the doctor
recognized that the outbreak was due to a virus in group A, but he did not know
the subgroup. Then he reported the outbreak to the World Health Organization in
Geneva. W.H.O.
published the important news alongside reports of a similar outbreak in Hong Kong, where about 15-20% of the population had
become ill.
As soon as the London doctors received the package of throat
samples, doctors began the standard tests. They found that by reproducing
itself with very high speed, the virus had grown more than a million times
within two days. Continuing their careful tests, the doctors checked the effect
of drugs against all the known sungroups of virus type A. none of them gave any
protection. This ,then, was something new, a new influenza virus, against which
the people of the world had no help whatever.
Having found the virus they
were working with, the two doctors now dropped it into the noses of some specially
selected animals, which get influenza much as human beings do. In a short time
the usual signs of the disease appeared. These experiments proved that the new
virus was easy to catch, but that it was not a killer. Scientists, like the
general public, call it simply Asian flu.
The first discovery of the
virus, however, was made in China
before the disease had appeared in other countries. Various reports showed that
the influenza outbreak started in China, probably in February of
1957. by the middle of March it had spread all over China. The virus was found by
Chinese doctors early in March. But China is not a member of the World
Health Organization and therefore does not report outbreaks of disease to it.
Not until two months later, when travellers carried the virus into Hang Kong,
from where it spread to Singapore,
did the news of the outbreak reach the rest of the world. By this time it was
well started on its way around the world.
Thereafter, W.H.O.’s Weekly
Reports described the steady spread of this great virus outbreak, which within
four months swept through every continent.