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- 4) The scientists have...
1) not created a metamaterial because it is impossible.
2) created a metamaterial but they have not tested it yet.
3) not created a metamaterial yet, though it is possible.
4) created and tested the metamaterial.
- Lake Titicaca is a large, deep lake in the Andes on the border of
Bolivia and Peru. By volume of water and by surface area, it is
the 5) (LARGE) lake in South America.
- It 6) (CALL) the “highest navigable lake” in the
world, with a surface elevation of 3812 metres. Five major river
- systems feed into Lake Titicaca. In order of their relative flow
volumes 7) (THIS) are Ramis, Coata, Have,
Huancane, and Suchez.
- 8) (MANY) than twenty other smaller streams
flow into Titicaca. The lake has 41 islands, some of which are
- densely populated. Since 2000 Lake Titicaca 9) (EXPERIENCE) constantly decreasing water levels. Between
- April and November 2009 alone the water level 10) (DROP) by 81 cm, reaching the lowest level since
1949. This drop was caused by shortened rainy seasons and the
- Magritte's work 11) (FREQUENT) displays a
collection of ordinary objects in an
- 12) (USUAL) context, giving new meanings to
familiar things.
- While he was getting his 13) (EDUCATE) at art school in Brussels, he began to work in
- the same time. His gained 14) (POPULAR) over a
relatively short period of time and soon took part in several 15)
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