[考试指导有的放矢谈谈我的托福考前准备]如今参加托福考试的人越来越多，似乎成为了二十一世纪的流行事物。所以这里就简单谈谈托福考试的备考方法。这些基本上是我自己的一些实际经验，并不具有型，也不见得适合每个考生...+阅读
Astronauts take out the trash
Astronauts on Sunday exchanged supplies for trash that has accumulated on the international space station since shuttles were grounded after the 2003 Columbia tragedy. They also prepared for a second spacewalk set for Monday.
Space shuttle Discovery, which docked at the orbiting outpost Thursday, became the first shuttle to return to orbit last week. Among the mission's goals: Resupply the station and remove the mounds of trash that he accumulated in recent years.
"It is kind of just like working in your closets and your garage," station flight director Mark Ferring said. "It's a lot of work."
The astronauts are unloading 15 tons of cargo. They expect to return to Earth with 13 tons of trash and other items that are no longer needed on the station.
When the station's two-man crew awoke Sunday, they were told that their seven Discovery guests would remain at the station for an additional day.
"Hopefully it is not going to be like the relatives who miss their flight and he to stay another day," Charles Hobaugh, who works in the station's mission control, told crew members by radio.
A ninth day at the station was approved late Saturday, days after NASA decided to ground future shuttle missions because an almost one-pound piece of foam broke free of Discovery's external fuel tank. The piece of foam missed Discovery, but was a haunting reminder of Columbia.
A 1.67 pound chunk of foam shed from Columbia's external tank hit the shuttle's left wing and caused a hole that allowed the searing gases of re-entry to melt the wing from the inside out. The shuttle disintegrated over Texas as it returned to Florida. All seven astronauts died.
NASA spent hundreds of millions of dollars over 2{ years redesigning the external tank, but said last week it did not solve the problem and more work is needed.
Bill Gerstenmaier, the station's program manager, said Discovery will lee the station in much better shape than when it arrived. Water will be left behind, as well as laptops, wash cloths, a printer, dry wipes, floppy disks, food and nitrogen.
"We are going to be in very good shape through the end of the year," Gerstenmaier said.
Shuttles are needed for the supplying and continued construction of the station.
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