B. quicken our heartbeat and responses

C. pour large quantities of adrenaline into our bloodstream

D. help us respond quickly to danger and protect ourselves

33. Fear becomes a problem only when         .

A. the danger is thought greater than it really is

B. the danger is more psychological than physical

C. one cannot stand the danger

D. one is not well prepared for it

34. Different responses of newborn infants to a loudly slammed door imply that         .

A. some people are inherently more easily affected by danger

B. people’s response to stimuli is not an inherited feature

C. some people seem to be very sensitive to noise

D. people sometimes seem to turn a deaf ear to noise

35. Psychologists have found that our later fears are determined largely by our         .

A. home education                           B. school education

C. parents’ lifestyle                      D. early experiences

Passage Two

Sea horses are unusual parents. The female sea horses lay the eggs，but unlike other creatures，it’s the males that give birth to the young.

Male sea horse have a fold of skin on their bellies that forms a pocket，called a brood pouch. During the breeding season，the sea horse’s pouch swells to receive eggs. A female sea horse lays up to 200 eggs at a time in the pouch. Then she swims off，leaving her male partner to care for the developing eggs and give birth to young sea horses. The female will return every day to check on her mate and the eggs，but she doesn’t stay long，nor does she take part in the birth.

It takes from two to six weeks for the eggs in the male’s pouch to develop. During this time the male avoids open water and hides in sea grass. His big pouch makes it difficult for him to swim，so the male often uses his tail to grasp a piece of sea grass. Firmly，gripping the grass，he will stay perfectly still for hours or even days. The male sea horse will change his color to blend with his surroundings and avoid being seen by predators who will try to eat him or poke holes in his pouch to get the eggs.

 The eggs hatch inside the male’s pouch. When the babies begin moving around，the male sea horse knows it’s time for them to be born. He grabs a sea grass stem with his tail and begins rocking，bending，and stretching his body back and forth． This causes the opening to enlarge until it is wide enough for the first baby sea horse to shoot out. The father sea horse continues rocking，bending，and stretching his body so that the rest of the babies can be born. Sometimes he has to press his pouch against a rock or some stiff seaweed to force the young out.