In the mass extinction 65 million years ago, ______ of all species on earth vanished.
A: two thirds
B: half
C: 90%
D: 30%
A: two thirds
B: half
C: 90%
D: 30%
举一反三
- __________ of the surface of the earth __________ covered with water. A: A third; is B: A third; are C: Two thirds; is D: Two thirds; are
- One million of the earth’s eight million species are in danger.( )
- We’ll leave our school in________. A: two year and a half B: two years and a half C: two and half a years D: two and half a year
- Two thirds of the earth _________ covered by water. A: are B: be C: has D: is
- 2、According to the text, _________of the domestic waste in the U.S. per year is packaging material. A: All B: More than two thirds C: Half D: A quarter