更多"Sound travels four times faster in "的相关试题:
[单项选择]______ travels faster than ______.
A. The light, sound
B. Light, the sound
C. Light, sound
D. The light, the sound
[填空题]In still air drops of water larger than 0.008 inch in diameter would fall to earth.
[单项选择]Most growing plants contain much more water than all other materials combined. C.R. Dames has suggested that it is as proper to term the plant a water structure as to call a house composed mainly of bricks as a brick building. It is certain that all the essential processes of plant growth and development occur in water. The mineral elements from the soil that are usable by the plant must be dissolved in the soil solution before they can be taken into the root. They are carded to all parts of the growing plant and are built into essential plant materials while in a dissolved state. The carbon dioxide (CO2) from the air may enter the leaf as a gas but is dissolved in the leaf before it is combined with a part of the water to form simple sugars — the base material from which the plant body is mainly built. Actively growing plant parts are generally 75 to 90 percent water. Structural parts of plants, such as woody stems no longer actively growing, may have much less water than g
A. forming sugars
B. sustaining actively growing parts as well as woody stems
C. absorbing mineral elements
D. taking in carbon dioxide from the air
[单项选择]
Passage Four
More than 11,000 traffic lights and
"Don’t Walk" signals in New York City have been switched to light-emitting
diodes that use 90 percent less energy than conventional fixtures. More than
180,000 energy-guzzling refrigerators in public housing projects have been
replaced with new ones that use a quarter of the power of the old ones. For
years, New York has been the city that not only never sleeps, but the city that
hardly ever remembers to turn the lights out. On the coldest days of winter, New
Yorkers raise their windows to let out the heat. In the dog days of summer, a
husky could freeze in the open doorway of a Fifth Avenue boutique. But now,
measures like more efficient traffic lights and refrigerators are speeding up a
long trend making New York one of the most energy-efficient cities in the
nation--and officials in cities lik
A. Environmentally conscious.
B. Energy-efficient.
C. Resource-wasting.
D. Multicultural.
[填空题]Smokers need to drink more water than non-smokers.
[单项选择]Some fish have a greater （） for acid water than others.
A. tolerance
B. resistance
C. dependence
D. persistence
[单项选择] Passage Four
Women earn less than men do. For
example, in 1998 the hourly wages of women in the U. S. were 26% less than those
of men. The gap between male and female incomes varies with age. The gap between
the labor incomes of young women and young men varies. It’s also clear that jobs
in which women are concentrated pay less. The larger the number of workers who
are women in ran industry, the lower the average wages.
Why do
women earn less than men do Can the differences be explained by the fact that
women are looked down upon If so, the government has to intervene(干预), to force
the employers to pay equal wages to equal jobs. However, there is no agreement
among economists about the causes of the gap. One view argues that women, on the
average, have chosen low-paying jobs in which workers enjoy the freedom of
entering and leaving the lab
A. there are more than enough women in the labor force
B. women have more freedom in selecting jobs
C. women are only provided with low-paid jobs
D. women are less experienced than men
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