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从数据库管理系统的角度看，数据库系统一般采用如下图所示的三级模式结构。图中①②处应填写(51)，③处应填写(52)。
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According to the first paragraph of the passage, the author considers which of the following to be most helpful in determining the value of special protective labor legislation for women？
Section A
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
听力原文：F: If anybody wants tickets for Friday's game, let me know. My roommate has two she can't use.
M: What is she asking？
Q: What does the man want to know？
(12)
听力原文： Diamonds are the hardest substance known on Earth and they make sparkling jewelry as well as sawblades that can cut through pretty much anything. They form. deep within the Earth's mantle layer (about 200 km deep ) when atoms of the element carbon arrange themselves into a lattice under huge amounts of pressure from the load of rocks above.
Recently, geologists studying diamonds have identified the ages of thousands of diamonds from Southern Africa, where the mineral is most abundant. Their research found that there were only three times in Earth's history when diamonds were made and that the Earth no longer makes diamonds like it used to. Something was different then. Perhaps the planet was hotter on the inside, or the composition of the rocks was subtly different. "Whatever it was it has changed now," stated Steve Shirey of the Carnegie Institution in Washington, D.C., one of the project researchers.
The oldest diamonds were made 3.3 billion years ago when Earth was relatively young. The second time diamonds formed was 2.9 billion years ago. The youngest diamonds on Earth are 1.2 billion years old although a few smaller diamonds are about 100 million years old. Small bits of rock within those diamonds, called impurities, indicate that they probably formed from rocks laid down in a shallow sea suggesting that the carbon that made the diamonds probably came from the remains of ancient sea life.
Some people like diamonds because they are pretty, rare, or expensive but Dr. Steve Shiley has a different perspective. "I think of diamonds," he said, "as being tiny time capsules that encase a little piece of rock protecting it for billions of years and providing us with a unique window on ancient times."
(33)
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
When we worry about who might be spying on our private lives, we usually think about the Federal agents. But the private sector outdoes the government every time. It's Linda Tripp, not the FBI, who is facing charges under Maryland's laws against secret telephone taping. It's our banks not the Internal Revenue Service (IRS), that pass our private financial data to telemarketing firms.
Consumer activists are pressing Congress for better privacy laws without much result so far. The legislators lean toward letting business people track our financial habits virtually at will.
As an example of what's going on, consider U.S. Bancorp, which was recently sued for deceptive practices by the state of Minnesota. According to the lawsuit, the bank supplied a telemarketer called Member Works with sensitive customer data such as names, phone numbers, bank-account and credit card numbers, Social Security numbers, account balances and credit limits.
With these customer lists in hand, Member Works started dialing for dollars-selling dental plans, videogames, computer software and other products and services. Customers who accepted a "free trial offer" had 30 days to cancel. If the deadline passed, they were charged automatically through their bank or credit card accounts. U.S. Bancorp collected a share of the revenues.
Customers were doubly deceived, the lawsuit claims. They didn't know that the bank was giving account numbers to Member Works. And if customers asked, they were led to think the answer was no.
The state sued Member Works separately for deceptive selling. The Company denies that it did anything wrong. For its part, U.S. Bancorp settled without admitting any mistakes. But it agreed to stop exposing its customers to nonfinancial products sold by outside firms. A few top banks decided to do the same. Many other banks will still do business with Member Works and similar firms.
And banks will still be mining data from your account in order to sell you financial products, including things of little value, such as credit insurance and credit-card protection plans.
You have almost no protection from businesses that use your personal accounts for profit. For example, no federal law shields "transaction and experience" information-mainly the details of your bank and credit-card accounts. Social Security numbers are for sale by private firms. They've generally agreed not to sell to the public. But to businesses, the numbers are an open book. Self- regulation doesn't work. A firm might publish a privacy-protection policy, but who enforces it？
Take U.S. Bancorp again. Customers were told, in writing, that "all personal information you supply to us will be considered confidential." Then it sold your data to Member Works. The bank even claims that it doesn't "sell" your data at all. It merely "shares" it and reaps a profit. Now you know.
Contrary to popular belief, the author finds that spying on people's privacy ______.
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