For questions 1-8, read the text below and decide which answer (А, В, C or D) best fits each gap. There is an example at the beginning (0).
|A beneath||В lower||C minus||D less|
Mars on Earth
The centre of Antarctica, where winter temperatures frequently fall to 0 _____ 80 degrees centigrade and for four months each year there is 1 darkness 24 hours a day, is one of the most extreme environments on Earth. It is also by 2 the most similar place to the surface of Mars, which is why a 3 of thirteen scientists from the European Space Agency have spent nine months at a base there.
They have been studying the physical and psychological 4 on humans of living in extreme conditions, in order to obtain a better understanding of the difficulties humans will 5 during the long flight to Mars and their stay there. Of course, space is 6 Antarctica in that astronauts have to adapt to weightlessness, but the base is 3,200 metres above sea 7 making it difficult to breathe there – as it can be on space flights. They have also, like space travellers, experienced strong feelings of being 8 off from civilisation.