【单选题】氯消毒副产物主要是由水中的哪些物质和氯反应生成的( )
【简答题】When 18th-century scientists first came across Australia’s platypus(鸭嘴兽), they thought it was a trick. It is not surprising that the platypus made people confused. This funny-looking animal has feet a...
【简答题】Ireland has had a very difficult history. The problems started in the 16 th century when English rulers fried to conquer(征服) Ireland. For hundreds of years, the Irish people fought against the English...
【简答题】阅读理解。 Ireland has had a very difficult history. The problems started in the 16th century when English rulers fried to conquer (征服) Ireland. For hundreds of years, the Irish people fought against the E...