更多"[不定项选择题]共用题干
Seeing Red Means Dang"的相关试题:
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Seeing Red Means Danger Ahead
The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule is a group of atoms（原子）held together by chemical bonds. Molecules come_________(55)all shapes
and sizes,and make up __________ (56)you can see,touch or feel.How a molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
_________(65)
A.a pair of
B.a type of
C.a lot of
D.a part of
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Study Confirms Red Meat Link with Bowel（结肠）Cancer
People who eat more than 160 grams of red or processed meat a day are 35 percent
more likely to develop bowel cancer than those who eat less_________(1)20 grams a
day,according to one of the biggest nutrition investigations ever carried out.
The European Prospective Investigation into Cancer and Nutrition followed 478,040
men and women________(2)35 to 70 from 10 European countries.
All subjects were free of cancer at enrollment between 1992 and 1998,but______
(3)an average follow-up of almost 5 years 1,329 bowel cancers had been reported.
The subsequent analysis,published in the Journal of the National Cancer Institute,
confirms the long-held suspicion________(4) high intakes（纳入量）of red meat are
associated with increased bowel_________(5)risk.
After taking into consideration factors like age,sex,height,weight,energy intake,
physical activity,smoking,and alcohol consumption,the investigators found that bowel
cancer was________(6)with intake of red and processed meat but not chicken.
Risk of bowel cancer dropped with increasing intake of fish.Eating more than 80 grams
a day of fish was associated________(7)a 31 percent reduction in risk compared with
eating less than 10 grams a________(8）.
Subjects with high red meat and low fish intake were at 63 percent higher risk of bowel
cancer compared with subjects with low red meat and high fish_________(9).In
addition,the risk of developing the disease was increased for_________(10)people
who ate a low fibre diet.
Sheila Bingham,study investigator at the UK's Medical Research Council nutrition unit,
said:"People have suspected for some time that high levels of red and processed meat
________(11)risk of bowel cancer,but this is one of the largest studies worldwide and
the first from Europe of this type to show a________(12)relationship."
She added in a statement:"The overall picture is very consistent for red and processed
meat and fibre across all the________(13)populations studied."
Study coordinator,Elio Riboli,of the World Health Organisation International Agency for
Research into Cancer,said:"Other risk factors for_________(14)cancer include
obesity（肥胖）and lack of physical activity. Smoking and excess alcohol may also play a
________(15).These factors were all taken into account in the analysis."
_________(6)
A.presented
B.selected
C.contrasted
D.associated
