单项选择题

When did NASA start working on a successor to the shuttle

A．One year before the Columbia disaster.
B．One year after the Columbia disaster.
C．Immediately after the Columbia disaster.
D．Years before the Columbia disaster.

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单项选择题

According to the passage, the 1 billion funds, if granted, would ______

A．be used to rebuild the International Space Station.
B．be awarded to the scientists working at NASA.
C．be shared by the two projects under the Space Launch Initiative.
D．be spent on the investigation of the Columbia disaster.

单项选择题

In ancient Greece, the Olympic Games ______

A．were merely national athletic festivals
B．were in the nature of a national event with a strong religious colour
C．had rules which put foreign participants in a disadvantageous position
D．were primarily national events with few foreign participants