题目内容
（请给出正确答案）
What has been a divisive issue across the United States？
［A］Whether affirmative action should continue to exist.
［B］Whether this law is helping minorities or the white majority.
［C］Whether racism exists in American college admission.
［D］Whether racial intolerance should be punished.
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更多“What has been a divisive issue…”相关的问题
The western part of the city has been ____as a development zone.
A)distinguished
B) divided
C) designated
D) assigned
What change has been made in the marketing arrangement？
A．A new consultancy has been contracted.
B．A new director has been appointed.
C．The present department has been expanded.
What news has just been received？
A．A stalled truck has been removed.
B．There is going to be weak fog.
C．Construction work is beginning in an area.
D．A route is now open for drivers.
A、Summarizing what has been said
B、Setting out the stages of the talk
C、Suggesting cause and effect
D、Adding a statement that is opposite to what has been said
All _____ is sheer nonsense. We must find a way out right now.
A. what has been said
B. the things
C. that has been said
D. of has been said
What kind of benefits has been or will be brought to us as a result of the researches？
A．Calorie restriction.
B．Apoptosis.
C．Cardiovascular disease.
D．Cancer prevention.
What has the man been invited to attend by the woman？
A．An evening party.
B．A meal in return.
C．A tea party.
●Let us now see how randomization is done when a collision occurs.After a(71),time is divided into discrete slots whose length is equal to the worst-case round-trip propagation time on the ether(2τ). To accommodate the longest path allowed by Ethernet, the slot time has been set t0 512 bit times, or 51.2μsec.
After the first collision, each station waits either 0 or l (72) times before trying again. If two stations collide and each one picks the same random number, they will collide again. After the second collision, each one picks either 0,1,2,or 3 at random and waits that number of slot times. If a third collision occurs (the probability of this happening is 0.25), then the next time the number of slots to wait is chosen at (73) from the interval 0 to 23-1.
In general, after i collisions,a random number between 0 and 2i-1 is chosen, and that number of slots is skipped. However, after ten collisions have been reached, the randomization (74) is frozen at a maximum of 1023 slots. After 16 collisions, the controller throws in the towel and reports failure back to the computer. Further recoveryis up to (75 )layers.
(71) A．datagram
B．collision
c．connection
D． service
(72) A．slot
B．switch
C．process
D．fire
(73) A．rest
B．random
C．once
D．odds
(74) A．unicast
B．multicast
C．broadcast
D．interval
(75) A．local
B．next
C．higher
D．lower
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