<閱讀測驗>第49至52題為題組 51. According to the passage， which of the following statements is true? (A) Mixing salt with water is not as easy as removing salt from seawater. (B) Desalinating seawater may kill some sea creatures and disturb the food chain. (C) Covering 70% of the Earth， the ocean has always satisfied human needs for water. (D) The increasing population in Saudi Arabia has resulted in shortages of fresh water.
