Page 154 - Tài Liệu Ôn Thi THPT Quốc Gia Môn Tiếng Anh

increase the risks of cancer and a range (4) debilitating diseases, a
discovery that has sent the medical world into a spin. Scientists are unsure
(5)______to why vitamins, so essential to health, can be toxic in high doses. The
most likely explauiation is that the body is only equipped to deal with the levels
found naturally in the environment. If the intake is too far (6)______the normal
rainge, then the body’s interned chemistry can be shunted out of ahgnment. (7)
______ this means is that the commercially sold vitamins and (8) ______
provided by nature are not always compatible. The commercial forms may
interfere with the body’s internal chemistry (9 )______“crowding out” the (10)
______natural 2Lnd benehcial forms of the nutrients. The vitamins obtained (11)
______ food are also allied (12) ______ a host of other substances which may
moderate (13)______augment their activity in the body. The latest advice (14)
______to eat a balanced diet to ensure you get all the nutrients you need, and if
you must take supplements make (15)______you take the lowest recommended
dose and follow the instructions on the bottle.

33. WHAT’S OUT THERE?
In 1969, Neil Armstrong was the íĩrst man to land on the moon. If
earthlings can take part in intergalactic travel, then why can’t life forms
from other planets do the same? Is Earth the only inhabited planet in the
universe? How can we be so sure of (1) ______ the existence or the non-
existence of extraterrestrial life?
On 24th June, 1947, Kenneth Arnold reported seeing nine silvery objects
moving rapidly through the sky near Mount Rainer, Washington. Obviously
he had no proof (2 )______than his testimony, but this sparked (3 )_______an
epidemic of apparent spottings of “unidentihed ílying objects”. In June and July
of the same year, a (4)______of 850 sightings of spaceships were reported.
Ufology had (5) ______ root and was spreading prolihcally. The latest
Gallup poll conveyed that twenty percent of the British and sixty percent of
the American populations believed in the existence of UFOs. In (6 )______ , a
French group claimed that we only hear (7 )______one in every 38,400 alien
visits to Earth. Clearly, these figures do not prove the existence of life (8)
______ in the cosmos, but they do prove that belief in humanoids is
international and vvidespread.
In alleged encounters with alien life, one (9 )______ of five leaves some
trace behind, such as burnt ground, lootprints, powdery residues or metallic
ữagments. One group of ulologists studied thousands of cases and (10)
______ to the conclusion that there were four main (11) ______ of
extraterrestrial existence; small humanoids, experimental animals,
humanlike entities and robots. However, Hilary Evans of the British UFO
Research Association admits (1 2 )______the inadequacies of all hndings and
testimonies. Some UEO witnesses lie, either deliberately or unconsciously.
So, with little (13) ______ than the word of an apparent eye witness to
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