单项选择题

We can infer that the plumbing （） at that time.

A．cost little
B．was more expensive than a water system
C．was too expensive for every family to afford
D．was not necessary

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单项选择题
26（）

A．for
B．as
C．at
D．with
单项选择题
Which of the following is NOT included in the display at the Botanical Museum of Harvard University（）

A．Models of 164 families of flowering plants.
B．Magnified details of flower parts.
C．Several species of native birds.
D．A group of diseased fruits.
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