【简答题】Australian scientists are trying to give kangaroo-style stomachs to cattle and sheep in order to cut the greenhouse gases they send out,which is thought to be responsible for global warming. Thanks to...
【单选题】The current concentration of carbon dioxide in the atmosphere is about 360 parts per million. Human activities are having a major influence on atmospheric carbon dioxide concentrations, which are risi...
A.
The local plants and animals will be permanently damaged.
B.
It is hard to know exactly what form. the local effects will take.
C.
Seawater levels will fall around the world.
D.
The effects will not occur in some regions of the world.