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【简答题】
Have you ever stayed in a hotel? Most Chinese hotels often provide guests with things like disposable (一次性的) toothbrushes, toothpaste, shampoo and slippers. Many guests like the idea because they don't have to bring their own. But, if you travel to Beijing, remember to bring your own things. Starting from June, some hotels in Beijing will no longer provide guests with these disposables. They want to ask people to use less disposable things. Many disposable things are made of plastic(塑料). People throw them away after only using them once. It is a waste of natural resources and is very bad for the environment. Do you know, one Chinese person makes as much as 400kg of waste a year! Most of that waste comes from disposable things. In Beijing, people throw away about 19,000 tons of plastic bags and 1,320 tons of plastic lunch bowls every year! Plastic can take between 100 and 400 years to break down. So the less plastic we throw out, the better. So, wherever you travel, bring your own things and use them again and again. Back at home and school, you can also do something to make our world a better place. Try to do these things in your daily life: Use cloth shopping bags, not plastic ones. After using a plastic bag, wash it out and let it dry. Then you can use it over and over again. Do not use paper cups. At your school canteen(食堂), use your own bowl and chopsticks instead of disposable ones. 小题1:Why do many hotels provide guests with some disposable things? A.Let their guests be convenient during their travelling. B.Hope their guests use less disposable things. C.Wish their guests to save money. D.Want their guests to use more disposable things. 小题2:Some Beijing hotels will no longer provide guests with ____. A.cheap food and drink B.disposable things C.good service D.free TV programs 小题3:Which of the following is NOT true? A.Many disposable things are made of plastic. B.Throwing disposable things away is a waste of natural resources. C.Plastic is very bad for the environment. D.Plastic breaks down easily. 小题4:What can we do to make our world a better place at home and school? A.Use shopping bags made of plastic. B.Do not throw away paper cups. C.Use disposable plates, bowls and chopsticks. D.Do not forget to reuse daily necessities(日用品). 小题5:We can tell from the story that ____. A.people don't like disposable things at all B.we can't use paper or plastic bowls at school C.we should use less plastic things and protect our environment D.hotels won't provide disposable things because they want to save money
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参考答案:
举一反三
【多选题】关于生产函数Q=f(L,K)的生产的第二阶段,应该:( )。
A.
开始于AP L 开始递减处(即AP L 的最高点),终止于MP L 为零处;
B.
开始于AP L 曲线和MP L 的相交处,终止于MP L 曲线和水平轴的相交处;
C.
开始于AP L 开始递增处,终止于MP L 递减处;
D.
开始于AP L 开始递减处(即AP L 的最高点),终止于AP L 开始递增处。
【多选题】下面说法错误的是( )。
A.
如果三相对称负载的额定电压为220 V,要想接入线电压为380 V的电源上,则应 接成三角形连接
B.
三相电路中,当使用额定电压为220 V的单相负载时,应接在电源的相线与相线 之间
C.
三相电路中,当使用额定电压为380 V的单相负载时,应接在电源的相线与相线 之间
D.
如果三相对称负载的额定电压为380 V,则应将它们接成三角形连接
【多选题】下面说法错误的是( )。
A.
如果三相对称负载的额定电压为220V,要想接入线电压为380V的电源上,则应接成三角形连接
B.
三相电路中,当使用额定电压为220V的单相负载时,应接在电源的相线与相线之间
C.
三相电路中,当使用额定电压为380V的单相负载时,应接在电源的相线与相线之间
D.
如果三相对称负载的额定电压为380V,则应将他们接成三角形连接
【判断题】如果一相对称负载的额定电压为220V,要想把赛马场接入线电压为380V的电源上,则应形成三角形
A.
正确
B.
错误
【多选题】下面说法错误的是( )。
A.
如果三相对称负载的额定电压为220V,要想接入线电压为380V的电源上,则应接成三角形连接
B.
三相电路中,当使用额定电压为220V的单相负载时,应接在电源的相线与相线之间
C.
三相电路中,当使用额定电压为380V的单相负载时,应接在电源的相线与相线之间
D.
如果三相对称负载的额定电压为380V,则应接成三角形连接
【判断题】如果三相对称负载的额定电压为220V,要想把它接入线电压为380V的电源上,则应接成三角形。
A.
正确
B.
错误
【单选题】关于生产函数Q= f(L、K)短期时的生产的第二阶段应该是
A.
开始于AP L 的最高点,终止于MP L 为零处
B.
开始于MP L 的最高点,终止于MP L 曲线和横轴的相交处
C.
开始于MP L 的最高点,终止于AP L 的最高点
D.
都不对
【单选题】假定其他条件不变,投资增加将引起()。
A.
国民收入增加,但消费水平不变
B.
国民收入增加,同时消费水平提高
C.
国民收入增加,但消费水平下降
D.
国民收入增加,储蓄水平下降
【多选题】下面说法错误的是( )。
A.
如果三相对称负载的额定电压为220V,要想接人线电压为380V的电源上,则应接成三角形连接
B.
三相电路中,当使用额定电压为220V的单相负载时,应接在电源的相线与相线之间
C.
三相电路中.当使用额定电压为380V的单相负载时,应接在电源的相线与相线之间
D.
如果三相对称负载的额定电压为380V,则应将它们接成三角连接
【简答题】关于生产函数Q=f(L,K)的生产的第二阶段,应该:( )。A. 开始于AP L 开始递减处(即AP L 的最高点),终止于MP L 为零处; B. 开始于AP L 曲线和MP L 的相交处,终止于MP L 曲线和水平轴的相交处; C. 开始于AP L 开始递增处,终止于MP L 递减处; D. 开始于AP L 开始递减处(即AP L 的最高点),终止于AP L 开始递增处。
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