填空题

The experiment requires that ________________ (要将材料加热至燃点).

【参考答案】

the material(should)be heated to its burning temperature

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单项选择题

A．In a clothing store.B．In a garden.C．At a cleaner’s.D．At a printing shop.

A．In a clothing store.
B．In a garden.
C．At a cleaner’s.
D．At a printing shop.

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solution

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