单项选择题

The word "harmful" in the last paragraph most probably means ______.

A．bad-affecting
B．ill-effective
C．widespread
D．irritating
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单项选择题
Most often attitudes are shaped by ______.
A．how the teacher introduces knowledge
B．what children learn at home
C．whether knowledge is learned from books of other sources
D．what children learn in the classroom
单项选择题
The author of the passage, readers can infer, intends to show the ______.
A．limitations of our technology
B．vastness of the cosmic reality
C．prospect of planetary travel
D．psychological impact of time and space
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