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【单选题】
C语言中运算对象必须是整型数据的运算符是( )。A.
！
B.
&&
C.
/
D.
%
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【简答题】从前人不合理使用化学物质造成的危害中得到启示，历史经验告诉我们，要可持续发展，就要合理使用化学物质。小明发现生活垃圾中存在大量的矿泉水瓶、塑料袋。在化学上通常把材料分成金属材料、有机高分子材料、非金属材料等，请帮他选出矿泉水瓶、塑料袋属于哪一类材料。然后请你谈谈使用塑料制品的利弊。
【单选题】What does "fruitful ideas do not come in an intellectual vacuum" mean?
A.
Most scientific discoveries do not occur in laboraories.
B.
Most chance discoveries are inspiration for well-designed exploration.
C.
Meaningful scientific discoveries can not be achieved without intellectual preparation.
D.
Chance discoveries are often triggered by the observation of an external event.
【单选题】The fight against a nuclear power station site has transformed a normally ______ town into a battlefield.
A.
sedate
B.
ludicrous
C.
malicious
D.
virtual
【简答题】list1=['地震','非典', 2008,2013]dellist1[2]print(list1)
【多选题】What are the responsibilities for a country in the fight against COVID-19?
A.
dramatically increasing testing capacity and care for patients
B.
developing life-saving medical interventions
C.
implementing effective containment strategies
D.
readying hospitals
E.
activating and enhancing emergency response systems
【单选题】What does the 2016 survey show about adult library users?
A.
Their interaction with teenagers proved fruitful.
B.
They used libraries less often than teenagers.
C.
They tended to visit libraries regularly.
D.
Their number increased modestly.
【单选题】What does “fruitful ideas do not come in anintellectual vacuum” mean?
A.
Most scientific discoveries do not occur in laboratories.
B.
Most chance discoveries are inspiration for well-designed exploration.
C.
Meaningful scientific discoveries can not be achieved without intellectual preparation.
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