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【单选题】
一百多年前,一艘远洋帆船,载着五个中国人和一些外国人,由中国开往欧洲。途中,除了五个中国人外,的人都病了。经诊断,都患了坏血病。同船的人生活条件都相同,大家都风餐露宿,一起飘洋过海,同样是人,为何判若异类?后来,经比较和研究得知,几个中国人所不同的仅仅在于他们有喝茶的嗜好,茶叶中有丰富的维生素有着对抗坏血病的功效。这里采用的求因方法是( )。A.
共变法
B.
求同法
C.
求异法
D.
剩余法
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【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
【单选题】I don’t smoke now, but I ____for almost ten years.
A.
ever smoked
B.
have ever smoked
C.
had ever smoked
D.
was ever smoking
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
【简答题】A． still B． even C． ever D． almost
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified.
B.
have usually left some traces.
C.
can usually be reconstructed.
D.
have always vanished without any trace.
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