15. The mayor of Beijing says that all construction work for the Beijing Olympics ____________ by 2006.

   A. has been completed     B. has completed

C. will have been completed  D. will have completed

二 完形填空30%

Scientists used to explore on the surface of the ocean. Now they are exploring  16   the surface, too. They want to know about ocean water and the plant and animal life   17   in the ocean.

   In 1934 the scientist William Beebe   18   3,000 feet below the surface in a hollow steel ball. In 1935 August Piccard dived 10,330 feet. In 1960 his son Jean dived to a    19   of 35,800 feet.

   All these early divers were deep. But the divers could not stay down   20   . They   21    back up to the surface    22    a few seconds. Scientists needed to stay down longer to study    23   below surface. Gradually they succeeded. Cousteau, a Frenchman   24   keep man down to a depth of 36 feet for one month and to s depth of 90 feet for a week.

   Now scientists are   25   even better equipment.  26   this new equipment, men can stay below the surface for days  27   even weeks. In 1962 Cousteau    28   a research station 35 feet below the surface. Then in 1964 he set up  29   station on the ocean floor of the Red Sea. This was the first undersea station  30   without help from the surface.

   Many countries are now studying undersea living. The former Soviet Union has an undersea laboratory in the Crimean Sea. The United States has a laboratory 50 feet down on the ocean floor  31   the Virgin Islands. In 1970 five men lived there for two weeks. Then a team of five women scientists stayed in the laboratory. Next   32   other teams of men. All were there to    33   the ocean depths and to make plans for the use of its resources. Scientists    34     enough mineral, vegetable, and animal wealth there to   35  food for the entire world.

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