单项选择题

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20.
What is the article about

A．Drug abuse and poison.
B．Household poisoning.
C．Poison control.
D．How to prevent poison from happening.
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单项选择题
Why did the Egyptians build the pyramids along the banks of the Nile
A．The river helped a lot in the transportation of building materials.
B．Pyramids had to be built on the west side of the Nile.
C．This must have been for religious reasons.
D．It was difficult to find large rock bases far from the river.
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