单项选择题

Some children display an ________curiosity about every new thing they encounter.

A．incredible
B．infectious
C．incompatible
D．inaccessible
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单项选择题
The success of a country in the New Age of Superstuff lies in________.
A．research
B．investment
C．innovation
D．application
单项选择题
Why is transition so difficult
A．Because transition requires money and time.
B．Because many manufacturers are unwilling to change their equipment.
C．Because research on new materials is very difficult.
D．Because it takes 10 years.
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