A．circuit B．circulation C．circular D．circleThe new curr……

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

单项选择题Undoubtedly, （）wins the election is going to have a tough job getting the economy back on its feet.

A．anyone
B．who
C．whoever
D．everyone

单项选择题Many old people in the cities find themselves unable to get used to the rapid （）of city life.

A．rate
B．speed
C．step
D．pace

单项选择题The issue （）at the conference is very important and it will create a sensation nationwide.

A．discussed
B．being discussed
C．is being discussed
D．has been discussed

单项选择题The captain of the ship （）the passengers that there was no danger.

A．assured
B．ensured
C．secured
D．insured