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【单选题】
在Java中，所有类的根类是( )。
A.
java.lang.Object
B.
iava.lang.Class
C.
java.lang.String
D.
java.lang.System
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】听力原文：W：When is Eric coming?M：Well，it's 10:30 now．I think he'll come in 50 minutes．Q：When will Eric arrive?(9)
A.
10:30.
B.
10:45.
C.
10:50.
D.
11:20.
【单选题】应用系统的事故危险指数模型，根据系统及其物质、设备(设施)和工艺的基本性质和状态，采用推算的方法，逐步给出事故的可能损失、引起事故发生或使事故扩大的设备、事故的危险性以及采取安全措施的有效性的安全评价方法是指( )。
A.
概率风险评价法
B.
伤害范围评价法
C.
物质系数评价法
D.
危险指数评价法
【单选题】听力原文： 'Go to the playground and have fun.' Parents will often say to their kids．But they should remember playgrounds can be dangerous．Each year about 200,000 children end up in hospital emergency room...
A.
Children don't get enough education in safety.
B.
The playgrounds are in poor condition.
C.
The playgrounds are overcrowded.
D.
Children are keen on dangerous games.
【单选题】While having orbited the sun, the satellite has sent more than four billion bits of information back to earth.
A.
orbiting
B.
to orbit
C.
being orbited
D.
having been orbited