单项选择题

Antonyms
PRECIPITATE:

A．intricate
B．devious
C．posthumous
D．dilatory
E． contradictory
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单项选择题
According to the passage, all of the following were true of the center of the atom EXCEPT that it
(A) had not yet been seen by the naked eye
(B) contained elements that were positively charged
(C) was very little larger than a molecule
(D) followed experimentally determinable processes
(E) was smaller than 1/125 millionth of an inch
单项选择题
It can be interred that prior to 1950, for a historian to choose to specialize in black history
(A) was encouraged by the academic establishment
(B) established his academic conventionality
(C) afforded him special opportunities for publication
(D) was detrimental to his professional career
(E) enhanced his contact with his colleagues
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