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【单选题】
Which of the following is equivalent to "when two days had elapsed, we again set forward."?A.
Two days had elapsed, we again set forward.
B.
Two days elapsed, we again set forward.
C.
Two days having elapsed, we again set forward.
D.
Two days elapsing, we again set forward.
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【简答题】Pollution of the ecosystem is a major
problem when waste is not managed carefully.
【单选题】The following main points are arranged in _____ order. I. The first major type of environmental pollution is land pollution. II. The second major type of environmental pollution is air pollution. III....
A.
topical
B.
problem-solution
C.
chronological
D.
spatial
【单选题】Pollution is the major ________ of the global warming. [ ]
A.
cause
B.
reason
C.
excuse
D.
event
【简答题】Pollution is a major (n. 恐吓;威胁 ) to the environment.
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