题目内容
Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. The conversation and question will be spoken only once. During the pause, you must read the four choices marked A, B, C, D, and decide which is the best answer. Then mark the corresponding letter on the ANSWER SHEET with a single line through the center.
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患者男性，35岁。血压180/100mmHg，经服硝苯地平及血管紧张素转换酶抑制剂治疗3周后，血压降至120/80mmHg。该患者的下一步治疗是
定量分析的任务是准确测定试样中被测组分的含量，须使分析结果具有一定的准确度，自于测量方法使用的仪器试剂和分析者主观条件等的限制，分析过程中误差是客观存在的。 下列属于系统误差的是
Passage 3 There are two main types of stocks: common stock and preferred stock. Common stock is, well, common. When people talk about stocks in general they are most likely referring to this type. In fact, the majority of stock issued is in this form. Common shares represent ownership in a company and a claim (dividends) on a portion of profits. Investors get one vote per share to elect the board members, who oversee the major decisions made by management. Over the long term, common stock, by means of capital growth, yields higher returns than almost every other investment. This higher return comes at a cost since common stocks entail the most risk. If a company goes bankrupt and liquidates, the common shareholders will not receive money until the creditors, bondholders, and preferred shareholders are paid. Preferred stock represents some degree of ownership in a company but usually doesn’t come with the same voting fights. (This may vary depending on the company. ) With preferred shares investors are usually guaranteed a fixed dividend forever. This is different from common stock, which has variable dividends that are never guaranteed. Another advantage is that in the event of liquidation preferred shareholders are paid off before the common shareholder (but still after debt holders). Preferred stock may also be callable, meaning that the company has the option to purchase the shares from shareholders at anytime for any reason (usually for a premium). Some people consider preferred stock to be more like debt than equity. A good way to think of these kinds of shares is to see them as being in between bonds and common shares. Common and preferred are the two main forms of stock ; however, it’s also possible for companies to customize different classes of stock in any way they want. The most common reason for this is the company wanting the voting power to remain with a certain group; hence, different classes of shares are given different voting rights. For example, one class of shares would be held by a select group who are given ten votes per share while a second class would be issued to the majority of investors who are given one vote per share. When there is more than one class of stock, the classes are traditionally designated as Class A and Class B. Berkshire Hathaway (ticker: BRK), the company of Warren Buffett (one of the greatest investors of all time), has two classes of stock. The different forms are represented by placing the letter behind the ticker symbol in a form like this: "BRKa, BRKb" or "BRK. A, BRK. B". According to the passage, companies can have different classes of stock mainly because the company wants ______.
定量分析的任务是准确测定试样中被测组分的含量，须使分析结果具有一定的准确度，自于测量方法使用的仪器试剂和分析者主观条件等的限制，分析过程中误差是客观存在的。 减少分析测定中偶然误差的方法为
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