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单项选择题

A．The Japanese mathematic teachers.
B．Both the speaker and his German friend.
C．Both Americans and immigrants.
D．The son of the speaker’s German friend.
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单项选择题According to the author, after human left the stage, a new species would develop ______.

A．in a process similar to that of human's evolution
B．from dolphin, chimp or orchid to human again
C．as much intelligence as human
D．after a particular span of time

单项选择题What does the author think interstellar travel can do

A．It practically enables human to escape the end of the world.
B．It simply postpones the process of human extinction.
C．It helps human avoid the fate of being vaporized or frozen.
D．It is a way to help human escape from death by gravity.