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【多选题】
下列坐标系中属于参心坐标系的有()A.
协议天球坐标系
B.
瞬时天球坐标系
C.
西安80坐标系
D.
北京54坐标系
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反馈参考答案：
举一反三
【简答题】A．It hasn't been bought by the librarian. B．It has been taken by a student. C．It has been lent out. D．It has been placed on reserve.
【单选题】He asked several questions_______ the professor who gave us a lecture_______the balance of nature.
A.
with; for
B.
from; of
C.
to; about
D.
of; on
【单选题】听力原文： President Bush gave the nation several clues Saturday about the per son he will nominate for a seat oil the Supreme Court, except for the most important one—a name. In his weekly radio address, ...
A.
that she failed to please either party in the Congress
B.
that she had served too long a time in the Court
C.
that she was 80 years old and ailing with thyroid cancer
D.
not mentioned
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