同學你好
如同你所說在steam locomotive之前canal building是在其高峰，反之在之後canal
building就不是在高峰，再換個方式來說就是衰退。
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http://www.merica.com.tw/course/teacher_data.html?teacherid=035
※ 引述《tom192180 (tom510558)》之銘言：
: Paragraph 2: This was before the steam locomotive, and canal building was at
: its height. The companies building the canals to transport coal needed
: surveyors to help them find the coal deposits worth mining as well as to
: determine the best courses for the canals. This job gave Smith an opportunity
: to study the fresh rock outcrops created by the newly dug canal. He later
: worked on similar jobs across the length and breadth of England all the while
: studying the newly revealed strata and collecting all the fossils he could
: find．Smith used mail coaches to travel as much as 10000 miles per year．In
: 1815 he published the first modern geological map “A Map of the Strata of
: England and Wales with a Part of Scotland”, map so meticulously researched
: that it can still be used today．
: 3. Which of the following can be inferred from paragraph 2 about canal
: building?
: ○Canals were built primarily in the south of England rather than in other
: regions．
: ○Canal building decreased after the steam locomotive was invented．
: ○Canal building made it difficult to study rock strata which often became
: damaged in the process．
: ○Canal builders hired surveyors like Smith to examine exposed rock strata．
: 想請問為什麼答案是二不是四?
: 就二來看，文章只說是這是在locomotive 出現前，運河建築還是在高峰的時候
: 可是沒有說之後就衰退了啊~"~
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