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【单选题】
某河段上、下断面的河底高程分别为725m和425m，河段长120km，则该河段的河道纵比降（ ）A.
0.25
B.
2.5
C.
2.5%
D.
0.25%
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反馈参考答案：
举一反三
【单选题】The principle of the heating system in this building is that pipes ________ hot water from the boiler to every part of it.
A.
consume
B.
conduct
C.
transmit
D.
convey
【单选题】This building is for a _______.
A.
family of three
B.
three people
C.
three peoples family
D.
three people’s family
【单选题】This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.
A.
if
B.
as
C.
since
D.
unless
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