根据《民办非企业单位登记管理暂行条例》及国家有关规定，下列关于举办民办非企业单位的说法，正确的

A．Prefixes

B．Suffixes

C．Roots

D．Affixes

A Affixes

B Prefixes

C Suffixes

D Inflectional morphemes

Which of the following is NOT usually considered as a stem？

A．Careless.

B．Fair.

C．Unselfishness.

D．Responsibly.

Which of the following is NOT usually considered as a stem？

A．Careless.

B．Fair.

C．Unselfishness.

D．Responsibly.

Which of the following is NOT usually considered as a stem？

A．Careless.

B．Fair.

C．Unselfishness.

D．Responsibly.

It seems unlikely that these animals could have detected seismic "pre-shocks" that were missed by the sensitive vibration-detecting equipment that clutters the world's earthquake laboratories. But it is possible. And the fact that many animal species behave strangely before other natural events such as storms, and that they have the ability to detect others of their species at distances which the familiar human senses could not manage，is well established. Such observations have led some to suggest that these animals have a kind of extra-sensory perception. What is more likely, though, is that they have an extra sense—a form. of perception that people lack. The best guess is that they can feel and understand vibrations that are transmitted through the ground. Almost all the research done into animal signalling has been on sight, hearing and smell, because these are senses that people possess. Humans have no sense organs designed specifically to detect terrestrial vibrations. But, according to researchers who have been meeting in Chicago at a symposium of the society for Integrative and Comparative Biology, this anthropocentric approach has meant that interactions via vibrations of the ground (a means of communication known as seismic signalling) have been almost entirely over-looked. These researchers believe that such signals are far more common than biologists had realized—and that they could explain a lot of otherwise inexplicable features of animal behaviour.

Until recently, the only large mammal known to produce seismic signals was the elephant seal, a species whose notoriously aggressive bulls slug it out on beaches around the world for possession of harems of females. But Caitlin O'Connell-Rodwell of Stanford University, who is one of the speakers at the symposium, suspects that a number of large terrestrial mammals, including rhinos, lions and elephants also use vibration as a means of communication. At any rate they produce loucf noises that are transmitted through both the ground and the air—and that can travel farther in the first than in the second. Elephants, according to Dr. O'Connell-Rodwell, can transmit signals through the ground this way for distances of as much as 50km when they trumpet, make mock charges or stomp their feet.

A seismic sense could help to explain certain types of elephant behaviour. One is an apparent ability to detect thunderstorms well beyond the range that the sound of a storm can carry. Another is the foot-lifting that many elephants display prior to the arrival of another herd. Rather than scanning the horizon with their ears, elephants tend to freeze their posture and raise and lower a single foot. This probably helps them to work out from which direction the vibrations are traveling—rather as a person might stick a finger first in one ear and then in the other to work out the direction that a sound is coming from.

In the past decade, many insects, spiders, scorpions, amphibians, reptiles and rodents, as well as large mammals, have been shown to use vibrations for purposes as diverse as territorial defense, mate location and prey detection. Lions, for example, have vibration detectors in their paws and probably use them in the same way as scorpions use their vibration detectors—to locate meals.

Dr. Hill herself spent years trying to work out how prairie mole crickets, a highly territorial species of burrowing insect, manage to space themselves out underground. After many failed attempts to provoke a reaction by playing recordings of cricket song to them, she realized that they were actually more interested in her own footfalls than in the airborne music of their fellow crickets. This suggests that it is the seismic component of the song that the insects are picking up and using to distribut

A．Animals can detect seismic "pre-shocks".

B．Animals can detect storms before they take place.

C．Animals can sense others of their species at distances.

D．Animals can sense vibrations transmitted through the ground.

A．A first-class letter.

B．Urgent mail.

C．A railway letter.

D．An airway packet.

A．the United States

B．the Far East

C．Western Europe

D．her neighbours