A: mode
B: source
C: pattern
D: foundation
举一反三
- If too many of these rare animals are killed, their kind will _______. A: die away B: die down C: die out D: die from
- Make the choice: A: Many more animals will die out if the forest continues to be destroyed. B: Many more animals have the instinct of protecting themselves from being extinct. C: The forest will become extinct if animals are killed. D: Many more animals are living in the forest.
- Many kinds of wild animals ______ from the earth. A: being disappearing B: being disappeared C: are disappearing D: are disappeared
- Why are the threats to fish more alarming than the threats to animals and birds? A: Because fish is a much needed food resource. B: Because plenty of fish is killed every year. C: Because fish is the only diet for many people. D: Because the sea fisheries are going to be exhausted.
- Many animals _______ in the cold. A: will die B: died C: dying
内容
- 0
Many species of animals have now from the face of the earth.
- 1
Many species of animals which once lived on the earth are no longer in ____.
- 2
The ecosystem on our planet is constantly changing because some species become ______ every day while new species are being discovered. A: are wiped out B: get prosperousB. C: become overpopulated D: remain instinctive
- 3
The ecological niche of a species refers to: A: Position of the organism in the food web B: Role in the community and all associated biotic and abiotic factors C: Mode of reproduction and food habits D: Behavior in relation to other species in the community
- 4
Most people have no real idea how to change to healthy food， and Maureen was no ________.（ ） A: exception B: ignorance C: foundation D: possibility