B. avoid a wide gap in income

　　C. build a socialist countryside

　　D. prevent civil unrest

　　4. Now Chinese population policy allows _________.

　　A. a minority couple to have two girls

　　B. a rich couple to have two children

　　C. a rural couple to have two boys

　　D. a city couple to have two children

　　（2）

　　Deep Drilling at Sea

　　Last June, a "floating university" is on board a ship called the JOIDES Resolution, equipped like a normal science lab. The 60 scientists aboard the Resolution set sail for the waters off British Columbia. They drilled holes deep into the ocean floor and conducted experiments that they hope will provide clues about what's happening in these largely unexplored areas.

　　This month, the ship is in waters off Costa Rica, drilling more holes deep into the seafloor. It will later head for the North Atlantic, looking for evidence of climate change in the distant past.

　　Resolution research

　　To gather data, an experienced crew lowers drill pipe through thousands of feet of water in order to go through 2,000 feet of mud and rock. Sometimes, they have to locate a hole drilled into the seafloor years before so that researchers can obtain a fresh sample.

　　To provide a steady platform, the ship has special engines to keep it in place, even in wavy seas.

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