According to the author, the development of the highly specialized technology, for space travel has not only made space travel possible but also _______.

A．At a hotel.
B．At a hospital.
C．In a bank.
D．At a school.

A．The pressure for high standards in American education.
B．The kids’ readiness for active participation in learning.
C．The prevalent eagerness to improve academic performance.
D．All of the above.