某小组在探究活动中,通过实践列出了白炽灯常见故障产生的原因与检修方法,下表给出了

题型:选择题

问题:

某小组在探究活动中,通过实践列出了白炽灯常见故障产生的原因与检修方法,下表给出了他们研究结果的一部分:对于"灯泡不亮" 的故障,从电路的状态来看,其可能原因可以概括成下列哪一类原因

[ ]

A、电路出现了短路                   

 B、电路出现了断路

C、并联变成了串联                  

D、电源正负极接反

考点:电路的三种状态:通路、短路和断路
题型:选择题
把3080000改写成用“万”作单位的数是(  )
A.308B.308万C.31万
题型:选择题

阅读理解。

     The market is a concept (概念). If you are growing tomatoes in your backyard for sale you are producing

for the market. You might sell some to your neighbors and some to the local managers of the supermarket. But

in either case, you are producing for the market. Your efforts are being directed by the market. If people stop

buying tomatoes, you will stop producing them.

     If you take care of a sick person to earn money, you are producing for the market. If your father is a steel

worker or a truck driver or a doctor or a grocer, he is producing goods or service for the market.

     When you spend your income, you are buying things from the market. You may spend money in stores,

supermarkets, gas station and restaurants. Still you are buying from the market. When the local grocer hires

you to drive the delivery truck, he is buying your labor in the labor market.

     The market may be something abstract (抽象的). But for each person or business that is making and selling

something, it is very concrete. If nobody buys your tomatoes, it won't be long before you get the message.

The market is telling you something. It is telling you that you are using energies and resources in doing

something the market doesn't want you to do.

1. Which of the following would be the best title of the passage? [ ]

A. Selling and Buying.

B. Everything you do is producing for the market.

C. What is the market?

D. What the market can do for you.

2. All of the following acts are producing for the market except _____. [ ]

A. working in a bank

B. attending a night school

C. printing a book

D. growing beans for sale

3. You are buying from the market when you _____. [     ]

A. borrow a book from the library

B. drive to the seaside for a holiday

C. look after your children

D. dine at restaurant

4. The word "concrete" in the last paragraph may most probably mean _____. [ ]

A. serious

B. important

C. necessary

D. real

5. In what way is the market very concrete for each person or business who is making and selling something? [ ]

A. It tells you what to produce

B. It provides you with everything you need

C. It tells you how to grow tomatoes

D. It helps you save money

题型:选择题

现在很多独身子女所必须面对和弥补的一种缺失是()

A、家庭关爱

B、与自我挫败作斗争的毅力

C、人生目标

D、责任意识

题型:选择题

应高度重视妊娠晚期出现的急性肝炎,主要因为:

A.易合并妊娠高血压综合征及发展为子痫
B.易发展为重型肝炎,孕产妇死亡率高
C.易发生糖代谢异常,影响胎儿发育
D.易发生早产,胎儿存活率降低
E.易发生宫缩乏力,产程延长

题型:选择题

请说出“六个老有”的具体内容是什么?

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