单项选择题

A．Recognize and define the problem.
B．Look for information to make the problem clearer.
C．Have suggestions for a possible solution.
D．Find a solution by trial or mistake.
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单项选择题
A．In 1585.B．In 1584.C．In 1583.D．In 1586.
A．In 1585.
B．In 1584.
C．In 1583.
D．In 1586.
单项选择题
A．Clay tiles.B．Slate or stone.C．Wooden shingles.D．Reeds or straw.
A．Clay tiles.
B．Slate or stone.
C．Wooden shingles.
D．Reeds or straw.
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