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

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

单项选择题How did Ruby paint at the very beginning（）

A．She used a stick to draw in the dirt.
B．She spent much time in the dirt.
C．She stimulated herself every day.
D．She painted with her keeper's art supplies.

单项选择题Millions of Americans flock to their drugstore to buy vitamins and minerals, （）that these pills can help to prevent serious illnesses.

A．convincing
B．convinced
C．to convince
D．to be convinced

单项选择题If they had sent a check to the telephone company last week, their telephone （）out of service at this moment.

A．will not be
B．will not have been
C．would not be
D．would not have been

单项选择题The extensive survey suggested that their assumptions （）totally wrong.

A．were
B．be
C．was
D．would be

单项选择题The first Olympiad is said to have consisted （）of a 200-yard foot race near the small city of Olympia.

A．nearly
B．completely
C．merely
D．identically