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【单选题】
It's very hot. There ______ no wind.A.
am
B.
is
C.
are
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【单选题】The Tragedy of the Commons will be evident when a growing number of sheep grazing on the town commons leads to a destruction of the grazing resource. To correct for this problem, the town could_______...
A.
allow individual shepherds to chose their own flock sizes.
B.
internalize the externality by subsidizing the production of sheep's wool.
C.
wait until the market corrects the problem.
D.
auction off a limited number of sheep-grazing permits.
【单选题】— How many sheep are there on the hill? — _____. [ ]
A.
Twenty dollars
B.
Number Twenty
C.
Twenty
【单选题】( )应采用相对独立分级设计,当其中任何一级系统故障时,均不应影响其他系统的正常运行:当故障解除后,应能自动进行系统的恢复处理。系统关键设备应冗余设置,重要数据应备份。
A.
车站联锁系统
B.
列车自动运行系统
C.
自动售检票系统
D.
行车指挥系统
【单选题】轧钢机架的作用是（）
A.
用来安装轧辊、轧辊调整装置和导卫装置等工作机座中全部零件，并承受全部轧制力的部件
B.
用来安装轧辊、轧辊轴承和导卫装置等工作机座中全部零件，并承受全部轧制力的部件
C.
用来安装轧辊、轧辊轴承、轧辊调整装置和导卫装置等工作机座中全部零件，并承受全部轧制力的部件
D.
用来安装轧辊、轧辊调整装置等工作机座中全部零件，并承受全部轧制力的部件
【单选题】There ______ eating grass in the forest. [ ]
A.
are a number of sheep
B.
is a number of sheep
C.
are a number of sheeps
【简答题】如果是在已有的元件库中创建元件,执行的菜单命令是 。
【单选题】A number of sheep _________ seen by us when we passed the field..
A.
is
B.
are
C.
was
D.
were
【单选题】In this remote area ______ with a limited number of sheep and cattle.
A.
can only a small farm be found
B.
a small farm can only be found
C.
only could be a small farm found
D.
could only be found a small farm
【单选题】---- Are those_________ ? ----No, they aren’t. They are _________ .
A.
sheep, goats
B.
sheep, goat
C.
sheeps, goats
D.
sheeps, goat
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