单项选择题

According to the passage, Corona is ______.

A．the first in a long series of satellites for development
B．an orbiting satellite for photo-reconnaissance
C．one satellite which launched 95 other satellites
D．a missile against the Soviet Union

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单项选择题

Which of the statements about the accomplishments of Corona is NOT true

A．It detected the early indications that China would explode their hydrogen bomb.
B．It outlined the extent of Israeli successes during the 1967 Middle East war.
C．It photographed all of the Soviet's medium-and intermediate-range missiles.
D．It identified the entire Soviet anti-ballistic missile network.

单项选择题

According to this passage, to be a para-professional one ______.

A．usually receives some training for doctors' work
B．is trained extensively for a certain period of time
C．graduates from a medical college or school
D．goes over the basic courses within 18 months