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Passage 3Questions 17 to 20 are based on the passage you have just heard. Which nation speaks slowest（）
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Passage 2Surprisingly, there is a relationship between sea salt and the making of rain drops. Most of the water droplets that make up clouds are formed around small, solid particles. In order to fall as rain, the cloud droplets have to increase in size. Clouds from which rain does not fall have droplets that are fairly uniform in size. Clouds that produce rain have some droplets that are much larger than others.The production of rain depends on the presence of the large droplets that grow in size by coalescence (a fusing together). There is evidence to support the theory that a particle of sea salt serves as the nucleus (核，核心) or center, around which the larger droplets form. Most of the sea salt probably enters the atmosphere from, bubbles that form on the surface of the sea. When the bubbles break, a tiny, even microscopic, droplet of salt water is cast into the air. Once in the atmosphere, the microscopic piece of salt collects water vapor from the air. The water vapor then condenses on the particle of salt. The moisture absorbed by the salt particles, dissolves the salt, thus leaving only a slightly salty cloud droplet.Cloud droplet, formed from condensation of salt particles of dust particles. The reason is that salt particles are usually larger than dust particles. Their larger size is instrumental (有作用的)in making the single rain droplet grow by coalescence with smaller droplets. Since low level clouds don't rise high enough to produce ice crystals as a source of condensation, it most likely is the salt particles that cause them to become rain clouds. The passage implies that, in order for rain to fall, it’s necessary for water vapor to （）.
Speaker A: Could I borrow a twenty to tide me over till payday next Thursday Speaker B: ______. I’ve just cashed the check. But do remember to pay me hack when your finances are in better shape.
American architecture is (1) its best when it is concerned with (2) that have a practical purpose. Factories, office buildings, public buildings, rail terminal and airports, and other such (3) show American architecture at its (4) imaginative and graceful, as well as its most (5) . The single most important American (6) design is the skyscraper, a style (7) in the late nineteenth century and since (8) as the trademark of American building. (9) the development of the steel skeleton and brick for buildings, the weight and low strength of stone and brick limited the (10) of the city office buildings (11) about twelve floors. (12) American cities grew larger in closing years of the 19th century, the (13) on which the structures might be placed because more valuable, the (14) for taller buildings increased. The use of steel (15) for construction was a direct response (16) this demand. The first office building to use the steel frame (17) was constructed in 1884. It soon became clear (18) . a steel--frame building could rise (19) four times as high us one of brick and stone. In a little more than ten years, the use of steel (20) has revolutionized the design of city office buildings, and the skyscraper was born. 8（）
When someone has money (56) he wants to put in a safe place, he (57) takes it to a bank. Until recently the very (58) of the bank building was designed to (59) people that their money would be safe. There were thick, solid walls and barred windows. All the windows and doors were wired to set (60) the burglar alarms if anyone tried to (61) his way in.The vaults where he money was kept had huge, steel doors with (62) locks. (63) guards with pistols in their holsters were always on (64) in the bank. The tellers cages--the cubicles (65) the bank clerks, or tellers, worked--actually (66) cages. They had gratings across the front, high sides and back, and a door that could be opened only by pushing a release button.The new style of bank design (67) some of these (68) features, but the idea now is to make the bank (69) like a friendly place (70) than a forbidding fortress. The modem bank buildings are open and light, (71) large glass windows and doors. The tellers’ cages have been (72) by flat, unobstructed counters. The (73) and burglar alarms are still there, but they are (74) noticeable than they (75) to be. 73().
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