单项选择题

A．How spiders gather food.
B．Why spider webs are so strong.
C．How spider build their webs.
D．How new kinds of structures might be designed.
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单项选择题
A．To look back to the early days of computers.B．To explain what technical problems may occur with computers.C．To encourage necessary investment in computers.D．To warn against a mentally lazy attitude towards computers.
A．To look back to the early days of computers.
B．To explain what technical problems may occur with computers.
C．To encourage necessary investment in computers.
D．To warn against a mentally lazy attitude towards computers.
单项选择题
A．The advantages of an economy based on farming.B．Reason that farmers continued using river transportation.C．The role of cotton in the United States economy.D．Improved methods of transporting farm crops.
A．The advantages of an economy based on farming.
B．Reason that farmers continued using river transportation.
C．The role of cotton in the United States economy.
D．Improved methods of transporting farm crops.
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