What produces a waterproof super glue,
acts like a vacuum cleaner, and even teaches scientists about gene repair The
humble little shellfish known as the mussel (贻贝)。
Mussels are
found worldwide. Some live in the sea. Others inhabit freshwater streams and
lakes. When you try to move a mussel from a rock, you will discover what an
incredibly firm grip it has- a necessity if the mussel is to resist the sharp
grab of a hungry seabird or the pounding waves of the sea. How does it manage to
cling so tight When it choose a place to set up home, it pokes its
tongue-shaped foot out of its shell and presses it against a solid surface.
Special glands give off a fluid mixture of proteins into a channel that runs the
length of the foot. The liquid quickly hardens into a fine, elastic thread about
an inch long. Then a tiny pad-like structur
A. seal itself from being damaged by sea water
B. protect itself from being the food of other animals
C. protect itself from being blown away by strong wind
D. produce the waterproof super glue
更多"Passage Five
What produce"的相关试题:
[单项选择] Passage Five
What produces a waterproof super glue,
acts like a vacuum cleaner, and even teaches scientists about gene repair The
humble little shellfish known as the mussel (贻贝)。
Mussels are
found worldwide. Some live in the sea. Others inhabit freshwater streams and
lakes. When you try to move a mussel from a rock, you will discover what an
incredibly firm grip it has- a necessity if the mussel is to resist the sharp
grab of a hungry seabird or the pounding waves of the sea. How does it manage to
cling so tight When it choose a place to set up home, it pokes its
tongue-shaped foot out of its shell and presses it against a solid surface.
Special glands give off a fluid mixture of proteins into a channel that runs the
length of the foot. The liquid quickly hardens into a fine, elastic thread about
an inch long. Then a tiny pad-like structur
A. the mussel’s tongue-shaped foot
B. the channel of the mussel’s foot
C. the thread given off by the mussel
D. some glands in the mussel’s body
[单项选择]Passage Five
You are what you eat notwithstanding, it is only recently that most consumers have become interested in the technical details of their food’s composition, production and transport. With obesity and climate change now major concerns, and "localvore" and "food miles" entering the lexicon, shoppers are clamoring for information. And many food companies are happy to supply it, resulting in a dizzying array of multicolored labels and claims.
But not everyone is happy. A proposed law in Indiana is the latest attempt in the United States to ban milk labels proclaiming that the cows from whence the milk came were not treated with recombinant bovine growth hormone (rBGH, also called recombinant bovine somatotropin or rbST). This hormone, produced by engineered bacteria, is virtually identical to the cow’s own and can increase milk production by 10-15%.
There are two bad arguments for banning such labels. The f~t -- that it is impossible to determine from the milk whe
A. from the internet
B. by means of law weapons
C. from labels and claims
D. with the dictionary
[单项选择]
Passage Five
The age at which young children begin to make moral discriminations about harmful actions committed against themselves or others has been the focus of recent research into the moral development of children. Until recently, child psychologists supported pioneer developmentalist Jean. Piaget in his hypothesis that because of their immaturity, children under age seven do not take into account the intentions of a person commit- ting accidental or deliberate harm, but rather simply assign punishment for on the basis of the magnitude of the negative consequences caused. According to Piaget, children under age seven occupy the first stage of moral development, which is characterizsd by moral absolutism (rules made by authorities must be obeyed) and imminent justice (if rules are broken, punishment will be meted out). Until youn
A. An outline for future research.
B. An expanded definition of commonly misunderstood terms.
C. An analysis of a dispute between two theorists.
D. A discussion of research finding in an ongoing inquiry.
[单项选择] Passage Five
Nanotechnology, according to its fans,
will jump-start a new industrial revolution with molecular-sized structures as
complex as the human cell and 100 times stronger than steel. The new technology
transforms everyday products and the way they are made by manipulating atoms so
that materials can be shrunk, strengthened and lightened all at once. To date
only modest nanotech-based products—such as stain-resistant fabrics and fresh
food packaging—have entered the market, but some scientists predict
nanotechnology will eventually be the only game in town. "It will be a
ubiquitous technology," said George Stephanopoulos, professor of chemical
engineering at the Massachusetts Institute of Technology. He echoes other
nanotech supporters who say industrial countries are already sliding toward its
use in every aspect of manufacturing.
A. help readers have a better understanding of nanotech
B. show that industries are all set for the nanotech age
C. tell readers the hurdles ahead the research of nanotech
D. reveal the potential benefits and big business of nanotech
[单项选择] Passage Five
Reforming the Social Security
retirement program is an issue of enormous practical importance. Yet it remains
the missing piece in American policy analysis. At a time when the Congress and
the Administration are considering ways to reform welfare, Medicare, Medicaid,
and the income tax, elected officials are still unwilling to confront the
serious problems of our Social Security system. Eventually, however, its
deteriorating financial condition will force major reforms. Whether those
reforms are good or bad, whether they deal with the basic economic problems of
the system or merely protect the solvency of existing institutional arrangements
will depend in part on whether we, as economists, provide the appropriate
intellectual framework for analyzing reform alternatives.
Major
policy changes that affect the public at large can o
A. courses.
B. thoughts.
C. people.
D. occasions.
E. none of the above.
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