在定时调整控制帧中有ToA，ToAWE和ToAWS的概念。ToA是特定CFN的下行链路帧的（）与实际到达时间的差值。正的ToA意味着帧在（）之前收到，负的ToA意味着帧在（）之后到达。
第1题：
By observing the behavior. of animals, scientists may be able to
A．prevent disasters.
B．organize groups of people.
C．predict earthquakes.
D．control areas of California.
第2题：
The requirements of the ISM Code may be applied to
A.only oil tankers
B.only passenger ships
C.only containers
D.all kinds of ships
第3题：
The underlined words “tipping points” most probably refer to
A. freezing points B. burning points C. melting points D. boiling points
第4题：
______ in the strange city, the poor boy fell to
A. Lost... crying
B. Lost... cry
C. Having been lost... cry
D. To lose... crying
第5题：
A、8,8
B、0,8
C、0,0
D、8.0
第6题：
The word “ruts”(line 1, paragraph 4) is closest in meaning to
A．tracks.
B．series.
C．characteristics.
D．connections.
第7题：
A.14，14
B.0，14
C.14，0
D.0，0
第8题：
” ruts”(in line one, paragraph 3) has closest meaning to
A. tracks B. series C. characteristics D. connections
第9题：
A.Canbeusedtomigratefroma6120toa6140andretainthesameserviceprofiles
B.Canonlybeusedonthefabricinterconnectonwhichitwascreated
C.Canbeusedtomigratefroma6120to6140andretainsystemIPaddressesandclusterinformation
D.Canbeusedtomatchfirmwareversionsbetween6120and6140duringamigration
第10题：