[单项选择]How does food affect mood and mind The answer may lie in the chemistry of the brain and nervous system. Molecules called neurotransmitters (神经传递素) are chemical messengers. They carry a nerve impulse across the gap between nerve cells. The release of neurotransmitter molecules from one neuron and their attachment to receptor sites on another keep a nerve impulse moving.
Nerve impulses carry messages from the environment to the brain, for example, the pain you feel when you stub (踢碰) your toe. They also carry messages in the other direction, from the brain to the muscles. That’s why you back away from the obstacle that initiated the pain signal and exclaim, "Ouch!"
"Many neurotransmitters are built from the foods we eat," says neuroscientist Eric Chudler of the University of Washington. Too little or too much of a particular nutrient in the diet can affect their production, Chudler says. For example, tryptophan from foods such as yogurt, milk, bananas, and egg
A. a transport vehicle
B. a protective shield
C. a power plant
D. a food factory

[单项选择]How does food affect mood and mind The answer may lie in the chemistry of the brain and nervous system. Molecules called neurotransmitters (神经传递素) are chemical messengers. They carry a nerve impulse across the gap between nerve cells. The release of neurotransmitter molecules from one neuron and their attachment to receptor sites on another keep a nerve impulse moving.
Nerve impulses carry messages from the environment to the brain, for example, the pain you feel when you stub (踢碰) your toe. They also carry messages in the other direction, from the brain to the muscles. That’s why you back away from the obstacle that initiated the pain signal and exclaim, "Ouch!"
"Many neurotransmitters are built from the foods we eat," says neuroscientist Eric Chudler of the University of Washington. Too little or too much of a particular nutrient in the diet can affect their production, Chudler says. For example, tryptophan from foods such as yogurt, milk, bananas, and egg
A. feel the pain
B. stub your toe
C. see an obstacle
D. exclaim "Ouch/

[单项选择]

Feeling anxious Your mood may actually change how your dinner tastes, making the bitter and salty flavors recede, according to new research. This link between the chemical balance in your brain and your sense of taste could one day help doctors to treat depression. There are currently no on-the-spot tests for deciding which medication will work best in individual patients with this condition. Researchers hope that a test based on flavor detection could help doctors to get more prescriptions right first time.
It has long been known that people who are depressed have lower-than-usual levels of the brain chemicals serotonin or noradrenaline, or in some cases both. Many also have a blunted sense of taste, which is presumably caused by changes in brain chemistry. To unpick the relationship between the two, Lucy Donaldson and her colleagues at the University of Bristol, UK, gave 20 healthy volunteers two antidepressant drugs, and checked their sensitivity to different tastes. T
A. people to gain better mood
B. doctor to cure depression
C. people to increase appetite
D. researchers to get prescriptions

[单项选择]
How may visitors enter the building
A. (A) With an employee escort.
B. (B) With permission from security personnel.
C. (C) With an identification badge.
D. (D) With proper dress.

[单项选择]
What does the woman say how distant object looks to her before a storm

[填空题]According to the passage, how may most intelligent adult feel facing children’s thirst for knowledge

[单项选择]What does John mean
A. John may go with Kate.
B. Nobody can go with John.
C. Kate has to go by herself.

[单项选择]Operator: Good morning. Future Software. How may I direct your call Customer: After Sales Service Department, please. Operator: __________. I’ll put you through.
A. Just a moment please
B. I see
C. Thank you
D. No problem

[单项选择]How exactly, does science work How do scientists go about doing science Ordinarily we think science proceeds in a straight-forward way. Ideally scientists make observations, formulate hypotheses (假设), and test those hypotheses by making further observations. When there is difference between what is observed and what is predicted by the hypothesis, the hypothesis is revised. Science proceeds in this way, which is a gradual method of finding the best fit between observation and prediction.
But this idealized version of how one does science is naive. Although science demands proof that observations made by one observer be observable by other observers using the same methods, it is by no means clear that, even when confronted with identical phenomena, different observers will report identical observations. And it is most certain that, even if the same observations are made, the conclusions as to the meaning of the observations frequently differ.
The fact is that all of us, scient
A. they had not much experience in building such a model of ship
B. it was too familiar to attract their attention
C. it was too far away from the coast
D. they had never met with big sailing ships like that before