Pick up speed where the channel widens
Run slower in the center of the channel
Hug the inside of a bend
Cause the greatest depth of water to be along the outside of a bend
第1题：
A.very laong
B.longer
C.longest
D.the longest
第2题：
The Thames River is the largest and most important river in Britain.()
第3题：
此题为判断题(对，错)。
第4题：
第5题：
For the deepest water when rounding a bend in a river, you should navigate your vessel____.
A.toward the inside of the bend
B.toward the outside of the bend
C.toward the center of the river just before the bend, then change course for the river’s venter after the bend
D.in the river’s center
第6题：
A.runs
B.is running
C.run
D.ran
第7题：
Currents are________in rate and direction.
A.vary
B.variable
C.variably
D.variability
第8题：
A. tend
B. tend into
C. tend to
D. to tend
第9题：
第10题：