题目内容
（请给出正确答案）
Why are researchers seriously concerned with the phenomenon of colony-collapse disorder？
A．Because honeybees produce one-third of the foods we eat．
B．Because honeybees feed on flowers．
C．Because honeybees eat seeds of flowers．
D．Both B and C．
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更多“Whyareresearchersseriouslyconcernedwiththephenomenonofcolony-collapsedisorder？”相关的问题
A、a. La reina Lü
B、b. La concubina Qi
C、c. La criada Jia Shi
D、
Suicide has been a cause of concern in most societies for a long time. The classical Greeks,for example, required people who wanted to kill themselves to get permission from the senate.
While this law is not without humor by today' s standards, it clearly shows an awareness of the problem in times gone by. In today' s society, suicide is much more prevalent than we want to admit. Why do people try to take their own lives？
(80) The motives for suicide can be categorized into areas such as a failure, wrath (暴怒),the need for attention，stress, and so on. However, the qualities of a person who wants to take his own life change from person to person, making it difficult to depict (描写) the typical vic-tim. To make the problem even more confusing, people will often camouflage (掩盖) their true feelings, thus causing their friends to disregard problems that should be viewed as serious.
In the United States, a network of centers has been created to attempt to prevent suicides.People who are bitter, worried, or depressed are encouraged to contact workers at these centers.These workers, often trained volunteers, offer benevolent advice to the callers, trying to help the callers to see that suicide as a solutions to problems is an illusion. The accomplishments of these centers, insofar(到这个程度 ) as their effectiveness to reduce suicide is concerned, are minimal.
However, they have helped a lot of people with a wide variety of problems. So, in the somewhat amorphous (难以名状的) area of man helping his fellow man, they are certainly a success.
Which of the following statements is TRUE according to the article？ 查看材料
A.The classical Greeks did not know the existence of suicide.
B.Suicide has always been prevalent in all parts of the world.
C.In today" s society， there are quite a number of people who commit suicide.
D.Nowadays suicide is not as common as it was in the past.
A young fellow recently finished the works of Thomas Carlyle, winding up, if we remember aright, with the ten note-books upon Frederick the Great. "What!" cried the young fellow, in consternation, "is there no more Carlyle？ Am I left to the daily papers？" A more celebrated instance is that of Alexander, who wept bitterly because he had no more worlds to subdue. And when Gibbon had finished the DECLINE AND FALL, he had only a few moments of joy; and it was with a "sober melancholy" that he parted from his labours.
A、Bai, Maonan, Mulao, Yi
B、Yi, Maonan, Miao, Bai
C、Bai, Yi, Maonan, Mulao
D、Maonan, Bai, Mulao, Yi
A device that provides early warning of a landslide by monitoring vibrations in soil is being tested
by UK researchers. Tile device could save thousands of lives each year by warning when an area should
be evacuated,the scientists say. Such natural disasters are common in countries that experience sud-
den, heavy rainfall,and can also be triggered by earthquakes and even water erosion.
Landslides start when a few particles of soil or rock within a slope start to move,but the early sta-ges can be hard to spot. Following this initial movement,"slopes can become. unstable in a matter' of hours or minutes, " says Nell Dixon at Loughborough University, UK. He says a warning system that monitors this movement "might be enough to evacuate a block of fiats or clear a road,and save lives. "
The most common way to monitor a slope for signs of an imminent landslide is to watch for chan- ges in its shape. Surveyors can do this by measuring a site directly,or sensors sunk into boreholes or fixed above ground can be used to monitor the shape of a slope. Slopes can, however, change shape without triggering a landslide, so either method is prone to causing false alarms. Now Dixon's team has developed a device that listens for the vibrations caused when particles begin moving within a slope.
The device takes the form. of a steel pipe dropped into a borehole in a slope. The borehole is filled in with gravel around the pipe to help transmit high-frequency vibrations generated by particles within the slope. These vibrations pass up the tube and are picked up by a sensor on the surface. Software an- alyses the vibration signal to determine whether a landslide may be imminent.
The device is currently being tested in a 6-metre-tall artificial clay embankment in Newcastle, UK. Early results suggest it should provide fewer false positives than existing systems. Once it has been carefully and thoroughly tested, the device could be used to create a complete early-warning system for dangerous slopes.
"Locations with a significant risk of landslides could definitely benefit from a machine like this, " says Adam Poulter,an expert at the British Red Cross. "As long as it doesn't cost too much. " But, Poulter adds that an early-warning system may not be enough on its own. "You need to have the hu- man communication, " he says. "Making systems that get warnings to those who need them can be dif-ficult. "
What does "Such natural disasters" in the first paragraph refer to？
A.Sudden, heavy rainfall
B.Earthquakes
C.Water erosion
D.Landslides
A.Right
B.Wrong
C.Not mentioned
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