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【多选题】
下列有关心动周期的正确叙述是( )。A.
心动周期是指心脏机械活动的周期
B.
心动周期是指心肌电活动周期
C.
心房和心室每收缩与舒为一个心功能周期
D.
当心率为75次·min -1 ，每个心动周期历时0.8S
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举一反三
【单选题】The number of books in this library has been increasing considerably in the past two years.
A.
vastly
B.
narrowly
C.
stably
D.
slowly
【单选题】( )制度是中国社会主义民主政治最鲜明的特点,是人们当家做主的重要途径和最高实现形式,是我国的根本政治制度。
A.
人民民主专政
B.
人民代表大会
C.
政治协商
D.
民族区域自治
【单选题】以下关于人民代表大会制度表述不正确的是:
A.
是中国社会主义民主政治最鲜明的特点
B.
是人民当家做主的重要途径和最高实现形式
C.
是社会主义政治文明的重要制度载体
D.
与西方议会民主制度相同
【简答题】A．A change in the nature of reading. B．An increase in the number of books. C．A change in the status of educated people. D．An increase in the average age of readers.
【单选题】The number of books in the bookshop is about 10,000 and a number of them _______ about science. [ ]
A.
is
B.
was
C.
are
D.
were
【单选题】The number of books in the bookshop is about 10,000 and a number of them about science.
A.
is
B.
was
C.
are
D.
Were
【单选题】Because the iris of the eye is flat, it’s easy to:
A.
change over time
B.
create an accurate video image
C.
be flexible
D.
move
【简答题】Because of the flat tire we missed the __________ to watch the final race.
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