A、spring and summer
B、spring and autumn
C、summer and winter
D、autumn and winter
A、spring and summer
B、spring and autumn
C、summer and winter
D、autumn and winter
A、Adding substances or energy that harm the environment.
B、Changing the population growth of species.
C、The decrease in the quality of the environment as a result of natural events
D、Substances or materials that are toxic to humans decreasing the quality of the human environment.
A、intriguing
B、providing important information
C、short and concise
D、detailed and vivid
A.one hundred and ten thousand,two hundred and eight
B.one hundred and ten thousands and two hundreds and eight
C.one hundred and ten thousand and two hundred and eight
D.one hundred,ten thousand,two hundred and eight
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