上行船舶作过河航行时，会出现（）不利影响。
A、航行阻力增加
B、航程增加
C、AB都对
D、AB都不对
参考答案：C
Their new bridge is being built now, which is said to be ______the old one.[ ]
A. the length three times of
B. three times the length of
C. three times as longer as
D. three times the length as
白霉苔
