单项选择题

By comparison, the author considers that ______.

A．a more advanced civilization will destroy us if they visit us at present
B．the original inhabitants of America were better off because of Columbus' visit
C．being visited by a more advanced civilization will do us good
D．we wouldn' t be better off even though we were visited by the beings from outer space at present
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单项选择题
Which of the following is NOT among the four possibilities of why we haven't been visited
A．Forms of life on the other planets don't evolve to intelligent beings.
B．Earth is the only planet that contains life in the universe.
C．life on the other planets destroys itself
D．Beings from outer space are too far away from us.
单项选择题
It can be inferred that had South Carolina not cast any electoral votes for Jefferson, the outcome of the 1796 election would have been a ______.
A．larger margin of victory for John Adams
B．victory for Thomas Jefferson
C．Federalist defeat in the Senate
D．victory for Thomas Pinckney
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