Negative dB values represent ______.

The () crown jewels are kept in the Tower of London.

A、valued

B、valueless

C、invaluA

D、Ble Eworthy

The ______ crown jewels are kept in the Tower of London.

A．valued

B．valueless

C．invaluable

D．worthy

The______crown jewels are kept in the Tower of London.

A．valued

B．valueless

C．invaluable

D．worthy

听力原文： Senators are people who are elected every 6 years and they represent a whole state. This means there are fewer Senators than Congress Representatives but they do have the power to defeat any bill that has been passed by the Congress. Their function is to provide more security over the decisions and actions of the Congress Representatives, and to make sure that bills, passed by the House of Representatives, are not driven by narrow local interests. In England, the British have an appointed House of Lords to provide a "second sober thought" about new laws. In America, Senators are thought to do the same thing but the primary difference is that they are elected and are very responsive to public opinion. However, because they do not have to face elections for 6 years, it was thought that they may be more rational than populists, although in practice the Senate and the Congress are still very much swayed by the views of public opinion or by powerful lobby groups. If the bill is passed in the Senate, then it goes to the President to either sign or reject. If he signs it, it becomes law, but if he rejects it, that is to say he vetoes the bill, or refuses to sign it, or as they say, "pocket vetoes it", it will be sent back to the Congress. If the Congress disagrees with the President enough and does not Want to change or amend the bill, they can override the President's rejection called overriding the veto.

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A．Their term.

B．Their duties.

C．Their function.

D．Their composition.

What can be inferred from the third paragraph?

A．The fraternal twins are much more valued by researchers.

B．Two kinds of twins are often been compared in research.

C．Identical twins are more likely to be addicted to smoking.

D．Fraternal twins are more genetically similar than identical twins.

What can be inferred from the third paragraph?

A．The fraternal twins are much more valued by researchers.

B．Two kinds of twins are often been compared in research.

C．Identical twins are more likely to be addicted to smoking.

D．Fraternal twins are more genetically similar than identical twins.

Park and Burgesss model has come to be known as the "concentric-zone model"(represented by the figure). Because the model was originally based on studies of Chicago, its center is labeled "Loop," the term commonly applied to that citys central commercial zone. Surrounding the central zone is a "zone in transition," an area that is being invaded by business and light manufacturing. The third zone is inhabited by workers who do not want to live in the factory or business district but at the same time need to live reasonably close to where they work. The fourth or residential zone consists of upscale apartment buildings and single-family homes. And the outermost ring, outside the city limits, is the suburban or commuters zone; its residents live within a 30-to 60-minute ride of the central business district.

The word "they" in the passage refers

A．Chicago-school sociologists

B．new groups of immigrants

C．separate areas

D．inner-city zones

Monochronic time (M-time) and polychronic time (P-time) represent two variant solutions to the use of both time and space as organizing frames for activities. Space is included because the two systems (time and space) are functionally interrelated. M-time emphasizes schedules, segmentation, and promptness. P-time systems are characterized by several things happening at once. They stress involvement of people and completion of transactions rather than adherence to preset schedules. P-time is treated as much less tangible than M-time. P-time is apt to be considered a point rather than a ribbon or a road, and that point is sacred.

Americans overseas are psychologically stressed in many ways when confronted by P-time systems such as those in Latin America and the Middle East. In the markets and stores of Mediterranean countries, one is surrounded by other customers vying for the attention of a clerk. There is no order as to who is served next, and to the northern European or American, confusion and clamor abound. In a different context, the same patterns apply within the governmental bureaucracies of Mediterranean countries: A cabinet officer, for instance, may have a large reception area outside his private office. There are almost always small groups waiting in this area, and these groups are visited by government officials, who move around the room conferring with each. Much of their business is transacted in public instead of having a series of private meetings in an inner office. Particularly distressing to Americans is the way in which appointments are handled by polychronic people. Appointments just don't carry the same weight as they do in the United States. Things are constantly shifted around. Nothing seems solid or firm, particularly plans for the future, and there are always changes in the most important plans right up to the very last minute.

In contrast, within the Western world, man finds little in life that is exempt from the iron hand of M-time. In fact, his social and business life, even his sex life are apt to be completely time dominated.

P-time is different from M-time in that P-time ______ .

A．represents space rather than time

B．emphasizes promptness rather than completion of transactions

C．can be considered a point rather than a sacred road

D．stresses involvement of people rather than schedules

A key difference between bonds and stocks is that stocks______.

A．are tax-exempt

B．represent ownership

C．represent borrowing

D．can be issued by state and local governments