单项选择题

Cost of pipeline is very different of underground conditions. Is it right? （）

A.Not
B.Yes
C.They can’t compare
D.Not discussion in the paragraph

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单项选择题

A.Yes, I do.
B.No, I do think so.
C.I don’t find it here
D.I can’t find it here

单项选择题

A.Natural gas
B.Crude oil
C.water
D.A, B and C

单项选择题

A.unqualified products
B.Different languages
C.Transportation delayed
D.Unreliable delivery of goods