一道阅读理解One Sunday,Mark decided to sailing in his boat with hi

一道阅读理解
One Sunday,Mark decided to sailing in his boat with his friend Dan,but Dan happened to be away.Dan’s brother John offered to go instead though he did not know anything about sailing.Mark agreed and they set out to sea.
Soon they found themselves in thick fog.Mark was sure that they be hit by a big ship.Fortunately he saw a large buoy(浮标) through the fog and decided to tie the boat to it for safely.As he was getting onto the buoy,however,he dropped the wet rope.The boat moved away in the fog carrying John,who did not know how to sue the radio.He drifted(漂流)about and was not seen until twelve hours later.
Mark spent the night on the buoy.In the early morning he fell asleep,and was having a bad dream when a shout woke him up.A ship,the Good Hope,came up and he climbed onto it and thanked the captain.The captain told him that John had been picked up by anther ship and the ship’s captain had sent out a message.“Without the message I would not have found you the buoy”,he said.
( )51.Why didn’t Mark and Dan go sailing together?
A.Mark was in some other place.
B.Dan was in some other place.
C.Dan asked his brother to go instead.
D.Mark would like to go with John.
( )52.Mark tried to tie the boat to the buoy so that
A.he could spend the night on it while John was looking for help
B.he and John could go sailing again when the fog cleared
C.he might be picked up by a passing ship
D.it wouldn’t be hit by other ships
( )53.John and Mark became separated because
A.John couldn’t control the boat and drifted away
B.John had to stay in the boat to radio for help
C.there wasn’t room for both John and Mark on the buoy
D.Mark thought it safe to stay on the buoy but John didn’t
( )54.What made it possible for Mark to be found on the buoy?
A.John told people where to look for him
B.He shouted when he caught sight of the Good Hope.
C.John radioed to the Good Hope to get him
D.The captain saw him as the fog cleared.

1b 2b 3a 4d