The biggest problem from now to the year 2010 for the ISS lies in that ______.A.Soyuz caps
The biggest problem from now to the year 2010 for the ISS lies in that ______.
A.Soyuz capsules are not safe enough
B.the ISS will have a 4-year crewless gap
C.more money is needed to maintain the normal operation
D.the ISS partner nations can't reach agreement during this period