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Multiple Choice

When upper surface of a lake is freezed, the temperature of the water beneath it is _________.

  1. <span style="font-family:" arial;="" font-size:="" small;="">less than 4<sup style="font-family:" arial;="">°<span style="font-family:" arial;="" font-size:="" small;="">C
  2. <span style="font-family:" arial;="" font-size:="" small;="">0<sup style="font-family:" arial;="">°<span style="font-family:" arial;="" font-size:="" small;="">C
  3. 4°C
  4. more than 4°C
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