Imagine a world white with snow all year, where it can be so quiet a) . that’s where maria davis and her husband, randy, lived for a year – in the antarctic. they went there to study the behavior of the weddell seals which are the only seals b) . maria and randy wanted to find out how the seals keep warm and what they eat during the long cold season. this kind of information may someday help humans survive in cold places. the seals had no fear of maria and randy, so they could get close enough to attach recorders to their hind flippers. the air temperature dropped every day. then, to their surprise, the seals disappeared. they knew that seals could not live in the severe winter weather, c) . maria and randy soon learned d) . they couldn’t see the seals, but they knew they were there e) .on land, seals bleat and baa like sheep. underwater, they sing. maria and randy stood on the ice and heard the seals peep, chirp, gurgle, and whistle, and knew they were under their feet. to avoid the cold, the seals spend the entire winter in water. the water is warmer than the air f) . there the seals are protected from the wind and are close to their food source. 1. but they didn’t expect them to vanish into thin air 2. because they could hear them 3. the seals had gone into the water under the ice 4. even though it is under a thick crust of ice 5. you can hear your heart beat 6. because they swam through the dark water under the ice 7. known to survive under ice
A - 5
B - 7
C - 1
D - 3
E - 2
F - 4