I am afraid to sleep. I have been afraid to sleep for the last few weeks. I am so tired that, finally, I do sleep, but only for a few minutes. It is not a bad dream that wakes me; it is the reality I took with me into sleep. I try to think of something else.
Immediately the woman in the marketplace comes into my mind. I was on my way to dinner last night when I saw her. She was selling skirts. She moved with the same ease and loveliness I often saw in the women of Laos. Her long black hair was as shiny as the black silk of the skirts she was selling. In her hair, she wore three silk ribbons, blue, green, and white. They reminded me of my childhood and how my girlfriends and I used to spend hours braiding ribbons into our hair.
I don’t know the word for "ribbons", so I put my hand to my own hair and, with three fingers against my head, I looked at her ribbons and said "Beautiful". She lowered her eyes and said nothing. I wasn’t sure
A. The writer was not used to bargaining.
B. People in Asia always bargain when buying things.
C. Bargaining in Laos was quiet and peaceful.
D. The writer was ready to bargain with the woman.
Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing. Consequently, more than 100 cities in the United States still have levels of carbon monoxide, particulate matter, and ozone (generated by photochemical reactions with hydrocarbons from vehicle exhaust) that exceed legally established limits. There is a growing realization that the only effective way to achieve further reduction in vehicle emissions — short of a massive shift away from the private automobile — is to replace conventional diesel fuel and gasoline with cleaner-burning fuels such as compressed natural gas, liquefied petroleum gas, ethanol, or methanol.
All of these alternatives are carbon-based fuels whose molecules are smaller and simpler than those of gasoline. These molecules burn more cleanly than gasoline, in part because they have fewer, if any, carbon-carbon bonds and the hydro
A. the combustion of gasoline releases photochemically active hydrocarbons
B. the combustion of gasoline involves an intricate series of reactions
C. gasoline molecules have a simple molecular structure
D. gasoline is composed of small molecules
| Most of us have seen a dog staring at,
sometimes snarling at, and approaching a reflection of itself. For most animals,
seeing their own image in a mirror acts as a social stimulus. But does the dog
recognize itself, or does the reflection simply signal a potential companion or
threat This question is interesting for a number of masons. Apart from
curiosity about the level of animals’ understanding, research on serf-
recognition in animals has several benefits. It provides some insight into the
evolutionary significance of this skill of serf-recognition and into the level
and kinds of cognitive competence that the skill requires. Such research also
indicates the kinds of learning experiences that determine the development of
self-recognition. In addition, work with animals fosters the use of techniques
that are not dependent on verbal re A. whether dogs recognize themselves in mirrors B. whether the grooming practices of chimps can be altered C. whether nonhumans have a serf-concept D. what her chimps change their behavior when a mirror is present [单项选择]Rarely we have seen such an effective actor as he has proven himself to be.
A. Rarely B. we have seen C. as he D. to be [单项选择]
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