单项选择题

How is the 1996 discovery related to the possible exist……

How is the 1996 discovery related to the possible existence of organisms on Mars

A．The meteorite containing organic compounds is part of Mars.
B．A Martian rock struck Earth about 11,000 years ago.
C．The organisms came back to life after the collision with Earth.
D．The inhabiting organisms appeared more than three billion years ago.

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单项选择题What were the Mars' seasonal changes in color believed to be

A．The natural changes on the planet.
B．The seasonal cycles.
C．The movement of some life form.
D．The storm of dust in its atmosphere.

单项选择题A variety of extracurricular activities are added in American schools （）

A．to help students climb the education ladder
B．to enrich students' dull life at school
C．to help students become more successful in later life
D．to extend college education down into elementary schools

单项选择题Which of the following can be the best title for this passage

A．Education and Success
B．Extracurricular Activities at School
C．Athletic Sports
D．Intellectual Achievement

单项选择题Why did Ruby start painting according to Dick George（）

A．Because she was seven years old.
B．Because she was the first to come to the zoo.
C．Because she learned a lot from the goat and the chickens.
D．Because she had no elephant partners to play with.

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.

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