Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage.

Write NO MORE THAN THREE WORDS for each answer.

    Since the earliest civilizations, people have controlled rivers to meet society's demands. Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation (航行), and to prevent flooding.

    River control is achieved by channelization, a term that covers a range of river engineering works, including widening, deepening, straightening and stabilization of banks, and by the construction of dams.

    An important period of channelization took place in Europe during the l9'th century, when many large rivers were straightened and their beds deepened. One of the most dramatically changed was the Tisza River, a branch of the Danube that flows through Hungary. The controlling of the Tisza, designed to reduce flooding and make land for agriculture, included cutting off more than 100 meanders (河曲), shortening the river's length by nearly 400 kilometers.

    One of the most common ways in which people control rivers is by damming them. The past 50 years or so has seen an increase in dam construction worldwide, and at the beginning of the 21^st century, there were about 800,000 dams globally, some towering more than 200 meters in height.

Despite their successes, many dams also cause significant environmental changes that prove harmful. Some particularly deep reservoirs (水库) can bring about earthquakes due to the stress on their bottom rocks caused by huge volumes of water. Downstream of a reservoir, the river is certainly influenced in many ways: water volume, speed and quality are all affected, leading to changes in the landscape and among plants and animals.

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    Horatio Spafford, who was born in 1828, was a wealthy Chicago lawyer with a promising career, a beautiful home, a wife, four daughters and a son.

    At the very height of his financial and professional success Horatio and his wife, Anna, suffered the loss of their young son. Shortly thereafter, on October 8, 1871, the Great Chicago Fire destroyed most of his real estate(地产) Investment.

    In 1873, Spafford planned a boat trip to Europe in order to give his wife and daughters a much-needed vacation and time to recover from the loss of their young son. Spafford sent his wife and daughters ahead of him while he remained in Chicago to take care of some small business. Several days later he received notice that his family's ship had had a collision (碰撞). All four of his daughters had drowned, only his wife had survived.

    With a heavy heart, Spafford boarded a boat that would take him to his broken-hearted Anna in England. It was on this trip that he wrote those now famous words: When sorrows like sea billows roll, it is well, it is well with my soul.

    Philip Bliss (1838-1876), composer of many songs, including Hold the Fort, Let the Lower Lights be Buming, and Jesus Loves Even Me, was so impressed with Spafford's life and the words of his hymn (赞美) that be composed a beautiful piece of music to accompany the poem. The song was published by Bliss and Sankey in 1876.

    For more than a century, the tragic story of one man has given hope to countless people.

下列语句中，没有语病的一项是(　　)

图中a表示纬线，E、F两点为晨昏线与该纬线的交点，O为EF的中点。读图回答下列问题。