One hundred years later – fifty years ago – the River Thames itself that was declared biologically dead, no longer able to support any life.
举一反三
- In history, which river once has been declared biologically dead, no longer able to support any life?
- When did the Internet get started? A: Fifteen years ago B: Fifty years ago C: Seventy years ago D: Eighty years ago
- One hundred years ago , what percentage of the human population lived in cities?
- A hundred years ago there were _____________ inhabitants on the island; now there are only ______.
- The river ______ very clean ten years ago, but now it is polluted.