It allows an animal to be adaptable—(), able to change in a new situation.
A.or
B.in other word
C.that is
D.however
A.or
B.in other word
C.that is
D.however
第1题
A. But Komfeld said scientists will not know about the applicability of the drugs in humans until a similar study is done on humans. “What’s very encouraging is that these drugs were developed to treat humans, and they are well understood, because they’ve been used for a long time, ” he said。
B. Later the scientists discovered that two related anticonvulsant drugs also lengthened the lives of the worms-in the case of one drug, by almost 50 percent. “This was a big surprise to use, Komfeld said. ”“We didn’t think anticonvulsant drugs had any particular relationship to aging. That connection was completely unexpected. ”
C. Roundworms are a poor subject for experiments, because they are not like humans, even though their molecules are similar. For example, they have no bones, nor do they show emotions, making it difficult to know how exactly human subjects would react to these drugs in large quantities. However, using the worms allows experiments to be conducted quickly, because they do not live for long。
D. “Somehow the neural activity seems to regulate the aging of all of the body the skin, musculature, and reproductive tract, ” Kornfeld said. “Somehow the nervous system coordinates the progress of all these tissues, evidently, though the life stages. But we don’t know how it does that. ”
E. The discovery may also shed light on the little-understood aging process. Since the drugs act on the neuromuscular systems of both humans and worms, the findings hint at a link between neural activity and aging。
F. Unlike vertebrates, the worms are ideal subjects for the study of aging because of their short life spans, which last only a couple of weeks in a laboratory. The worm is well known in genetics, and the worm’s genome has been sequenced。
G. Use of this drug has been permitted by law since 1998 and wider use is now expected as a result of the studies. “We can clearly link this drug with human aging, but we still need to find proof, says Kornfeld optimistically. ”
第2题
A.Utility allows for activation of resources by the hour. CUoD allows for permanent access to additional resources installed into the system.
B.Utility allows for permanent access to additional resources installed into the system. CuOD allows for activation of resources by the hour.
C.Utility allows for activation of resources by the minute. CUoD allows for permanent access to additional resources installed into the system.
D.Utility allows for a 30 day usage of additional resources installed into the system. CUoD allows for permanent access to additional resources installed into the system.
第3题
A. Allows interfaces to share common IP addresses.
B. Allows an interface to remain up without the aid of keepalives.
C. Allows a router to send routing and not receive updates via that interface.
D. Allows a routing protocol to forward updates that is missing its IP address.
E. Allows a router to receive routing updates on an interface but not send updates via that interface.
第4题
A.It allows switches to read frame tags.
B.It allows ports to be assigned to VLANs automatically.
C.It maintains VLAN consistency across a switched network.
D.It allows frames from multiple VLANs to use a single interface.
E.It allows VLAN information to be automatically propagated throughout the switching environment.
第5题
A. Allows the core to create a separate space to process threads
B. Allows the processor to handle multiple threads per core
C. Allows the core to shift to a higher clock speed based on thread count
D. Allows the processor to reject certain threads to increase performance
第6题
A.It allows L2F tunnels across the network.
B.It allows GRE tunnels across the network.
C.It allows PPTP tunnels across the network.
D.It allows PPP to be tunneled across a network
第7题
The(72)is a collection of computers connected together by phone lines that allows for the global sharing of information.
A.interface
B.Internet
C.LAN
D.WWW
第8题
A.it allows you to see the picture of your speech at a glance.
B.it allows you to see the content of your speech at a glance.
C.it allows you to see the full scope and content of your speech at a glance.
D.none of the above
第9题
A.VTP allows routing between VLANs.
B.VTP allows a single port to carry information to more than one VLAN.
C.VTP allows physically redundant links while preventing switching loops.
D.VTP allows switches to share VLAN configuration information.
第10题
第11题
The(67)controls the cursor or pointer on the screen and allows the user to access commands by pointing and clicking.
A.graphics
B.printer
C.program
D.mouse
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