A person who sees someone fall overboard should（）.

A . immediately jump in the water to help the individual B . call for help and keep the individual in sight C . run to the radio room to send an emergency message D . go to the control room for the distress flare

A . immediately jump in the water to help the individual B . call for help and keep the individual in sight C . run to the radio room to send an emergency message D . go to the control room for the distress flare

A . has the ownership of a vessel B . has the ship owned by a shipping company C . owns no ship of a shipping company D . owns the ship named by a register of shipping

A . call for help and keep the individual in sight B . run to the radio room to send an emergency message C . immediately jump in the water to assist the individual D . go to the bridge for the

A . message B . letter C . sentence D . notice

A . immediately reverse the engines B . stop the propellers from turning and throw a ring buoy over the side C . increase speed to full to get the vessel away from the person D . first put the rudder hard over in either directio

A . immediately jump into the water to assist the individual B . call for help and keep the individual in sight C . run to the radio room to send an emergency message D . go to the bridge for the distress flare

In the study, participants watched a short video of a person conditioned to fear a so-called neutral stimulus-something people normally wouldn't fear--paired with something they find naturally aversive (令人讨厌的), in this case an electrical shock. The person in the video watched colored squares on a computer screen: When a blue square appeared, the person received a mild shock; when a yellow square appeared, there was no shock. The participant in the video responded with distress when the blue square appeared—he would blink hard, tense his cheek muscles and move his hand. "So it's clear that he's uncomfortable, he's in distress," said study team member Andreas Olsson of Columbia University. "And he's already in distress before he receives the shock, you see him anticipate receiving the shock." By contrast the participant in the video appeared relaxed when the yellow square popped up, Participants were told they would take part in a similar experiment, and when presented with the blue square, they responded with fear, anticipating a shock, though they were never actually shocked. "Just by watching, they learn themselves," Olsson explained. This second learning was reflected in the brain. In previous classical conditioning experiments where a fear is learned firsthand, a part of the brain called the amygdala (扁桃核) has been shown to be critical to the development and expression of fears. The scientists monitored the brain activity of each participant during the experiment. Imaging showed that the amygdala responded both when the subjects watched the video of someone else receiving shocks and when they were presented with the blue squares themselves. "We found that the amygdala is involved both when you're watching somebody receiving shocks, and when you're expecting to receive shocks later on yourself," Olsson said. So it seems that similar processes in the brain are triggered both when fears are experienced first-hand and when they are observed in others. In the real world, the finding could explain why some people are afraid of things despite little contact with them. "You learn by observing other people's emotional expressions, and what we are showing is that that can be as effective as having those direct experiences yourself," Olsson said. "That's probably one of the reasons why a lot people are having phobias (恐怖症) of certain kinds of stimuli, such as snakes and spiders." What's people's response to a neutral stimulus？ A．Normally they are not scared by it. B．Usually they are seriously scared by it. C．They feel ridiculous when seeing it. D．They often feel uncomfortable at it.

A．gesturing B．handshaking C．smelling D．hand-stroking

A．ticket and carry-ons B．ticket and baggage to check C．printing boarding pass and carry-ons D．printing boarding pass and baggage to check

Down-to-earth persons may be【34】______members of society, of course. But they do not let their importance "【35】______to their heads". They do not consider themselves to be better persons than【36】______of less importance. Someone who is filled with his own importance and pride, 【37】______without cause, is said to have "his nose in the air". There is【38】______way a person with his nose in the air can be down-to-earth. Americans【39】______another expression that means almost the same as " down-to-earth". The expression is " both-feet-on-the-ground". Someone【40】______both-feet-on-the-ground is a person with a good understanding【41】______reality. He has what is called "common sense, " he may have dreams, 【42】______he does not allow them to block his knowledge of【43】______is real. The opposite kind of【44】______is one who has his " head-in-the-clouds". A man with his head-in-the-clouds is a dreamer【45】______mind is not in the real world. 【46】______, such a dreamer can be brought back to earth. Sharp words from teacher can usually【47】______a day-dreaming student down-to-earth. Usually, the person who is down-to-earth is very【48】______ to have both feet on the ground.【49】______we have both our feet on the ground, when we are down-to-earth, we act honestly and openly【50】______others. Our lives are like the ground below us, solid and strong. (31)

A．loves and admires himself excessively B．is characterized by apathy and isolation C．is interested in nothing but being noticed D．strives to be the best through thick and thin

A．the same opportunity cost of spending time on leisure activities B．a higher opportunity cost of working an additional hour C．a lower opportunity cost of driving farther to work D．a higher opportunity cost of taking the day off work

A．cool-minded B．cold-blooded C．unfriendly D．passionate