Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.

Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.

   A. disappeared     B. disappearing     C. disappear     D.having disappeared

This species has nearly _________because its habitat is being destroyed.

This species has nearly _________because its habitat is being destroyed.

1. A.
   died down
2. B.
   died out
3. C.
   turned down
4. D.
   turned up

Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.

1. A.
   disappeared
2. B.
   disappearing
3. C.
   disappear
4. D.
   having disappeared