试题详情

The scientists ______ in sending Yang Liwei into outer space and bring him back to the earth.

er Yang Liwei succeeded in circling the earth, ______ our astronauts desire to do is walk in space.

After Yang Liwei succeeded in circling the earth, ______our astronauts desire to do is walk in space

stead of pictures of the family,the album shows changes around the globe in the past 25 years. A ne

The key to the industrialization of space is the U.S. space shuttle.______ it, astronauts will be ab