你可能感兴趣的试题
present available left sustainable
It is safe. It is capable. It is friendly to the environment. All of the above are right.
It is about sustainable transportation. It is about greenhouse effects. It is about environment protection. It is about air pollution.
Air and water pollution. Greenhouse effects. The use of land and other natural resources. All of the above.
affordable available persistent continuable
positive critical negative doubtful
It should be efficient. It should be safe. It should be friendly. It should be constructive.