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问题 选择题

下列微粒的符号中，对"2"含义的理解正确的是[ ]

A、2Cu中的"2"表示2个铜元素

B、Fe2+中的"2"表示每个亚铁离子带有2个单位的正电荷

C、H2S中的"2"表示一个硫化氢分子中含有两个硫原子

D、中的"2"表示在氧化钙中钙元素带有2个单位的正电荷

答案

答案：B

单项选择题

下列句子中，没有语病的一句是*

A．我们不但要改造世界，而且要认识世界．

B．只要充分调动群众的积极性，才能做好工作．

C．新加坡的竹节虫，不仅体色几乎和竹子一样，体形在安静时，也完全像一根树枝．

D．你把这本书捎给他，省得我再跑一趟．
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填空题



In the early 1970’s, Citibank of New York City became one of the first financial institutions to install ATM’s on a large scale. Since then, the (1) of automated teller machines has increased dramatically. At the time, the bank hoped (2) their operating costs by replacing human tellers with machines. Little did they (3) that the cash machines would become so successful. However, as more banks added (4) automated service through ATM’s, the machines mushroomed all over the world.
To use an ATM, all you need is a (5) issued by your bank. Your bank may also (6) through a credit card, such as MasterCard or Visa. To begin a (7) , you need to insert the card into an ATM and punch in a personal identification number on the (8) . The personal ID number may consist of (9) and can prevent anyone from using the card.
The ATM next flashes instructions on its (10) for carrying out transaction. To get cash, for example, you are instructed to (11) that indicate whether the money should be withdrawn from a checking or a savings account and the (12) . This request is then displayed on the screen. After you press a button to (13) that the information is correct, the ATM goes to (14) .
How safe, you may ask, is banking by ATM The (15) is meant to prevent anyone, no matter who you are, from using a cash card (16) . If you enter the wrong ID number for a card, a message on the screen will (17) . If you fail to produce the correct number for three times, most machines will (18) .As another precaution against (19) , the bank generally limits the amount that may be withdrawn by cash card (20) , say, to $ 200.
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