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【单选题】
The author supports his ideas mainly by providing __________.A.
facts and examples
B.
statistics
C.
different people's experiences
D.
reasons and explanations
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【简答题】A.Colorado. B.Arizona. C.The Nile River. D.The Museum of Natural History,
【简答题】Vancouver(温哥华) Natural Resources As a major centre for the global forestry industry, Vancouver is host to many international forestry conferences and s, and the natural home of the massive BC for...
【多选题】天然气含H2S多少的分类Classification of how much H2S natural gas contains（）
A.
无硫或微含硫天然气 H2S和CO2含量符合管输要求，不需要净化The content of H2S and CO2 in sulfur-free or slightly sulfur-containing natural gas meets the requirements of pipeline transportation and does not require purification；
B.
低含硫天然气 H2S含量约为0.0001～0.5％（体积）H2S content of low-sulfur natural gas is about 0.0001 ~ 0.5% (volume)；
C.
中含硫天然气 H2S含量约为1～1.5％（体 积），CO2含量约为6～8％（体积）H2S content of natural gas containing sulfur is about 1-1.5% (volume), and CO2 content is about 6-8% (volume).；
D.
高含硫天然气 H2S含量一般为4～8％（体积）high sulfur natural gas：H2S content of high-sulfur natural gas is generally 4-8% (volume)
【单选题】The description of the past natural environment is important in that
A.
it is one part of human history:
B.
it should be included in the history of the universe.
C.
it can partly explain the way of life of the people in the past.
D.
it decided the human history,
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