单项选择题

Why did people in the 19th century believe the existence of intelligent life on Mars

A．Because the surface of Mars seemed to be geometric.
B．Because the lines were drawn across the surface of the planet.
C．Because a system of canals was thought to be there.
D．Because it was the Martians that built the canals.

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热门试题

单项选择题Americans believe that education is （）

A．the only way to success
B．the main purpose of the schools
C．just like climbing ladders
D．important to success

单项选择题When Elephants Paint is a book （）

A．on the history of arts
B．about the painting elephants in Asia
C．explaining how to teach elephants to paint
D．chiefly theorizing about elephant art

单项选择题Ruby was an Asian elephant （）

A．who was sold for a price as high as $ 5,000
B．who was famous for being the first painting elephant
C．whose paintings sold for as high as $ 5,000
D．who started painting in the late 1980s

单项选择题Which of the following is NOT mentioned as important to success（）

A．intellectual achievement
B．competitive personality
C．social backgrounds
D．social and political skills

单项选择题To encourage the elephants to paint well, the keeper（）

A．bought them a lot of art supplies
B．made them excited at the beginning
C．taught them to hold a paintbrush with their trunks
D．reinforced the desired behaviors with rewards