Direction: In the following questions, you have a brief passage with 5 questions following the passage. Read the passages carefully and choose the best answer to each question out of the four alternatives.
PASSAGE
Antarctica is shedding 160 billion tonnes a year of ice into the ocean, twice the amount of a few years ago, according to new satellite observations. The ice loss is adding to the rising sea levels driven by climate change and even east Antarctica is now losing ice. The new revelations follows the recent announcement that the collapse of the western Antarctica ice sheet has already begun and is unstoppable, although it may take many centuries to complete. Global warming is pushing up sea level by melting the world’s major ice caps and by warming and expanding oceans waters. The loss of the entire western Antarctica ice sheet would eventually cause up to 4 metres (13ft) of sea-level rise, devastating low-lying and coastal areas around the world. The new data, published in journal Geophysical Research Letters, comes from the European Space Agency’s CryoSat-2 satellite, which was launched in 2010. It shows that the western Antarctica ice sheet is where 87% of the lost ice is being shed, with the east Antarctic and the Antarctic peninsula shedding the rest. The data collected from 2010-2013 was compared to that from 20052010. The satellite measures changes in the height of the ice and covers virtually the whole of the frozen continent, far more of than previous altimeter missions. CryoSat-2 collected five times more data than before in the crucial coastal regions where ice losses are concentrated and found key glaciers were losing many metres in height every year. The Pine Island, Thwaites and Smith Glaciers in west Antarctica were losing between 4m and 8m annually.