On bard the Central America, a ship on her way from Havana to New York, were on fewer than 491 passengers. Most of them were miners（矿工）returning with their gold to their homeland. At the start of the voyage, the sky had been cloudless and the wind fair. Three days later, however, the ship was rolling in a storm.
Soon water poured in the engine-room and put out the fires. This left the ship helpless, with her engines stopped. In spite of all efforts, the depth of the water down below slowly increased. It became clear to all that nothing could save the ship, and that she would soon go to the sea bottom.
Just at that moment, a strange sight was seen on bard. Some of the miners collected their gold and stored it in their belts. They hoped to take it with them wherever they were going. But others knew that the ship would sink and didn't want to weigh themselves down with the heavy metal. So they threw it not the floor.
Unusual courage was shown by nearly all on bard. The captain moved about the ship encouraging all. He sometimes gave orders in attempts to save his ship, and sometimes kept silent, always determined. But all his efforts failed.
Fortunately, when all hope had gone, anther ship, the Marie from Boston, appeared on the scene. The Marie had also suffered heavily in the storm, but her captain immediately arranged to move the people in bats from the Central America to his own ship. The huge waves made the work painfully slow, but there was no disorder: everyone waited patiently. Finally, all passengers were saved.
The rescue work was made painfully slow mainly because _____.
A、the Marie also suffered heavily
B、there were too many passengers
C、the passengers rushed not the bats
D、the waves of the sea were to high
【正确答案】：D
【题目解析】：事实细节题。由第五段第三句可知，巨浪使得拯救工作进行得艰难又缓慢。故选D。
