填空题 For Questions 6～10, you will hear a passage about the ice loss in the Arctic Sea. While you listen, complete the sentences. Use not more than 3 words for each answer.

During the summer months, the newer ice is less ______.	{{U}}{{U}} 1 {{/U}}{{/U}}
The two measures of the health of the Arctic Sea are the amount of ice cover and ______.	{{U}}{{U}} 2 {{/U}}{{/U}}

Arctic Sea ice is important because it throws back ______.	{{U}}{{U}} 3 {{/U}}{{/U}}

A warmer Arctic and thinner sea ice changes the balance between the normally cold Arctic and ______.	{{U}}{{U}} 4 {{/U}}{{/U}}

The possibility of ships being able to move through newly unfrozen parts of the Arctic could lead to losses of ______.	{{U}}{{U}} 5 {{/U}}{{/U}}