【单选题】Precipitation , commonly referred to as rainfall, is a measure of the quantity of water in the form of either rain, hail or snow which reaches the ground. The average annual precipitation over the who...
【简答题】Questions 1-7 Complete the statements below using NO MORE THAN THREE WORDS for each answer. 1. Snow is a form of frozen water and it contains many groups of tiny ice __________ called snow crystals. 2...