老师，以下是VOA Special English中的一篇文章，我只摘抄了开始的一部份内容，请老师大概看一下：

The first human moon landing happened more than 50 years ago. But did you know that human astronauts were not the first Earthlings to travel in space and circle the moon?

That honor goes to two Russian tortoises and several smaller creatures that went along for the ride.

On September 14, 1968, the Soviet space program sent two tortoises — along with some flies and worms — into space for a trip around the moon. NASA calls it "the first successful circumlunar mission carried out by any nation."

After a week-long trip, the tortoises landed on Earth by parachute in the Indian Ocean. They traveled back to Moscow on October 7.

Both tortoises survived the trip but not the experiment. NASA records state that the animals were dissected on October 11, 1968, to see how their bodies were affected by the space travel.

Dissection showed that "the main structural changes in the tortoises were caused by a lack of food and not the space travel." The tortoises had lost about 10 percent of their body weight. But they had stayed active and showed no loss of appetite.