单项选择题

What does "brainchild" in the paragrapth 4 mean

A．Patent.
B．Invention.
C．Hope.
D．Pride.
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单项选择题
What of the following correctly describe Cosmos I
A．It is a 3-ft. metal pod.
B．It has eight 35-ft. metallic wings.
C．It can fly an altitude above 260 miles.
D．When it flies back to Earth, it will fall into pieces.
单项选择题
The territory which Thompson was exploring ______.
A．had been abandoned by the Mayas about thirteen hundred years previously
B．had been occupied and developed by the Mayas about thirteen hundred years before
C．had been deserted by the Mayas as soon as the Spaniards arrived
D．was conquered by the Mayas thirteen hundred years ago
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