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单项选择题

What does the passage mainly discuss

A．Trends in teaching mathematics to children.
B．The use of mathematics in child psychology.
C．The development of mathematical ability in children.
D．The fundamental concepts of mathematics that children must learn.
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单项选择题What is the most appropriate title for this passage

A．Two Types of Stocks
B．A New Strategy of Investment
C．Distinctions between Trading and Investment
D．Conflicting Perspectives on Stock Investment

单项选择题Why do people doubt about the pickup of Japan’s economy

A．Low domestic demand.
B．High energy cost.
C．Deflation.
D．Weaker economic growth in the U.S. and China.