Nhận biết (M1)

It is common for freshwater lakes near or above a latitude of north of the equator, like Opeongo Lake in Canada, to accumulate surface ice in winter

A study from 1980 to 2006 showed that, in general, the number of days per winter that such lakes have measurable amounts of surface ice is declining. However, a researcher claimed that some lakes have instead seen an increase in the duration of ice, citing as an example __________

Which choice most effectively uses data from the graph to complete the researcher's example?

• A.

  both Lake Baikal and Kalmarinjärvi, which had fewer than 200 days of ice in the winter of 1980-81.

• B.

  both Lake Baikal and Kalmarinjärvi, which had more than 120 days of ice in the winter of 2005-06.

• C.

  both Lake Mendota and Kalmarinjärvi, which had more days of ice in the winter of 2005-06 than they did in the winter of 1980-81.

• D.

  Lake Mendota, which had more days of ice in the winter of 2005-06 than it did in the winter of 1980-81.