单选题 Experiments have showed that ______.
A、birds depend on the sun to guide them
B、day-flying birds depend on the sun while night-flying birds depend on the stars
C、birds are likely to get lost if there aren't man-made stars
D、birds depend on the stars to guide them
单选题 In total darkness, doves ______.
A、find their way by clouds
B、use landmarks
C、circle helplessly
D、fly back home
单选题 The experiment with the dove indicates that ______.
A、some birds seem to follow the stars when they fly at night
B、a bird that has been caged will not fly long distances
C、birds can fly in the same direction as that taken by their cousins
D、a bird having spent its lifetime in a cage has to be taught how to navigate
单选题 Which of the following is NOT true about American friendship?
A、American friendship means a long life.
B、Americans may call casual acquaintances "friends".
单选题 Under man-made stars, the bird in the cage ______.
A、wouldn't fly well
B、changed direction when the position of the stars was changed
C、tried to fly in the opposite direction of birds not caged
D、stayed where it was
单选题 The boss said he could not afford to pay all his workers because of ____ orders.
A、decline
B、declining
C、declined
D、declines
单选题 What is the passage mainly about?
A、The importance of friendship.
B、Americans' attitude towards life.
C、Cultural differences in the world.
D、The way Americans view friendship.
单选题 The reason why birds don't get lost on long flights ______.
A、still remains a mystery
B、is known by everybody
C、has been discovered recently
D、has been known to scientists for years
2026-01-08
共89道
