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【单选题】
如果x商品和y商品是互补品的话，那么x商品的恩格尔曲线是( )。A.
一条水平线
B.
一条垂直线
C.
一条斜率为正的直线
D.
一条斜率为负的直线
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反馈参考答案：
举一反三
【简答题】计算机网络按照其传播方式的不同，我们可以将之分为 和”点-点网络“A. 广播网络
【单选题】The one thing we need to be alert about the Internet is ____________.
A.
to live our real life with a virtual identity
B.
not to let the virtual life online dominate our real life
C.
to accept whatever information coming to us
D.
to stop using it since it is doing harm to us
【单选题】Analysts commonly describe two distinct modes of communication in the Internet of Things: One is thing-to-person communication, and the other is_______.
A.
person-to-person communication
B.
person-to-thing communication
C.
thing-to-thing communication
D.
client-and-service communication
【单选题】The thing the author like best about the Internet is that ______.
A.
he is able to explain his ideas in a simple language
B.
his writing is not changed by his boss
C.
he is able to communicate with people all over the world
D.
a lot of people have left entries and thanked him for his efforts
【简答题】LED 数码管有 显示和 显示两种方式。
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