单项选择题

How many children (realize) that agriculture is a (source) of raw (materials) for clothing and (to shelter)（）

A．realize
B．source
C．materials
D．to shelter

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单项选择题
A principle of (manager) is to ensure that every (action) or (decision) achieves a carefully (planned) goal.（）

A．manager
B．action
C．decision
D．planned
单项选择题
(At a first), the scientific (method) may appear to be a (narrow) and restrictive way (of) gaining understanding.（）

A．At a first
B．method
C．narrow
D．of
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