gniwoflol od 10 doinW OA
sto ortul ONT (A)
baroni od nso isdW JA
ord bed vondt.95M lus (A)
ylioblo adt (A)
impact. Vesostition To Me
(B) Oceans and the creatures in them.
the covernatoqoqrad mazs verdwenly
(C) A biological study and its findings. (0)
(D) All drifting animals and algae in the oceans. 2 od tuoda a
bomoloq as sy woH (0)
50. What is the purpose of the project mentioned in the third paragraph?
(A) To remove junk in the ocean. oe bus cae! (B) To promote tourism in 210 regions. (a)
(C) To survey marine organisms. yob
(D) To provide more oxygen for the planet.
51 What does the word “mitigate” in the last paragraph probably mean? Luizasowuje s 2i 11 (C)
(A) Emphasize.
(B) Lessen.
(C) Ignore.
or cos w Torle (D) Generate.
52. According to the passage, what may happen if the amount of plankton drastically deceases?
(A) The ocean may shrink. moms
(B) Most marine creatures may die. otsa (5)
(C) Diatoms may become prosperous.
(D) It may worsen global warming.lus (CI
raianpo lobbon
To assolst od wolsa 8A
53.256.0 Ri de deprived on
Nuclear energy is an appealing alternative to fossil fuels, because it is carbon free and hence
doesn't contribute to global warming. However, the radioactive wastes generated after nuclear
fission takes place are the principal environmental concern. They must be well disposed of in
specially designed pools and then maintained in costly dry storage containers. They are highly
radioactive, hazardous to humans even with short-term exposure. The disposal and storage of
these radioactive isotopes as well as the decommissioned reactors cost taxpayers more than tens
of millions of dollars annually.
le; the White
sed Scientists are dedicated to the reuse of nuclear wastes. The researchers at the University
of Bristol in the U.K. are trying to encapsulate nuclear waste within diamonds. “The radiation
is locked safely away inside the gemstone, meanwhile providing a clean energy supply like a
long-lasting battery,” said the head of the team. They aim at carbon-14, a radioactive isotope
with a half-life of around 5,730 years and available in graphite blocks used to cool the uranium
rods. By heating the blocks, scientists convert carbon-14 into a gas and then gather it to form
a kind of “diamond”- since diamonds are just another form of carbon. To safely block the
short-range radiation it emits, scientists suggest the most solid substance on Earth, diamond, to
contain it. A diamond beta-battery comes into being as a result.
carly The same as what is confronting in dealing with nuclear waste stockpiles, the diamond
battery is highly-priced, too expensive to manufacture. However, researchers are still holding
an optimistic attitude toward it, speculating about its possible applications in anything where
