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阅读理解。 What will things be like in the year 2080? No one knows. But it is fun to have a guess at it. Let's make this a story about you in the year 2080. Our story will be about one day only. You wake up at seven in the morning. You get dressed. Guess what the clothes are made of? Paper? Glass? Or something we don't even know about today. The breakfast is no work to fix. Why? The food may be ready for eating. Now you start for work. But you don't go by car. You step onto a moving sidewalk. It moves you along to a train station. There you take a train. How will it run? On one rail high over the street? Or will it ride in air?  Three o'clock comes. Your work is done for the day. ' I'll call John , a friend of mine , '  you say. John answers the picture phone. You and he can hear and see each other. 'What shall we do this Saturday?'  you ask. ' Shall we put on our rocket belts and take a short trip? Or shall we go for a ride in a flying boat?' John may say , 'I want to ride in a rocket ship !  Let's fly to the moon ! ' 1. what things will be like in the year 2080. A. Some people know B. Nobody knows C. Scientists have found out D. Only a few clever people know 2. In the year 2080 the clothes we wear will be those we are wearing now. A. the same as B. heavier than C. stronger than D. different from 3. You may not need to spend any time in the year 2080. A. eating B. sleeping C. cooking D. traveling 4. You will take to go to work. A. a special train B. a bus C. a car D. a plane 5. Probably you can travel to the moon in the year 2080. A. in a train B. easily C. with much difficulty D. in a car
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参考答案:
举一反三
【单选题】机构的运动特性与下列因素中的()有关。
A.
以上均无关
B.
构件的形状
C.
运动副的具体结构
D.
各运动副的位置
【单选题】铝在氧气中燃烧生成三氧化二铝,则参加反应的铝、氧气,生成的三氧化二铝的质量比是 [     ]
A.
27︰32︰102
B.
54︰32︰102
C.
54︰24︰102
D.
108︰96︰204
【多选题】什么是机构运动简图( )
A.
不考虑与运动无关的因素,用线条表示构件
B.
用简单符号表示运动副的类型
C.
按一定比例确定运动副的相对位置及与运动有关的尺寸
D.
只为了表示机构的结构及运动情况
【单选题】基本放大电路中的主要放大对象是( )
A.
交流信号
B.
直流信号
C.
交、直流信号均有
【单选题】基本放大电路中的主要放大对象是
A.
直流信号
B.
交流信号
C.
交直流信号均有
【单选题】基本放大电路中的主要放大对象是( )。
A.
直流信号
B.
交流信号
C.
交直流成分均有
D.
电压
【判断题】在研究机构运动特性时,为了使问题简化,只考虑与运动有关的运动副的数目及相对位置,不考虑构件和运动副的实际结构、材料、运动副类型等与运动无关的因素。
A.
正确
B.
错误
【单选题】机构运动无关的因素有 。
A.
构件的数目
B.
运动副的类型
C.
构件的外形
D.
运动副的数目
【单选题】基本放大电路中的主要放大对象是( )
A.
直流信号
B.
交流成分、交流信号
C.
交直流信号均有
【单选题】机构的运动特性与下列因素中的( )有关。
A.
构件的形状
B.
运动副的具体结构
C.
各运动副的位置
D.
以上均无关
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