单选题The word "infringement" in the first paragraph means______.

单选题The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of human need; (21) is truly the mother of invention. People usually devise tools to (22) for natural deficiencies. For example, people invented weapons to defend (23) from physically superior (24) . But (25) is only one incentive for inventions. People also invent (26) tools to (27) certain established tasks more efficiently. For instance, people developed the bow and arrow from the (28) spear or javelin in order to shoot (29) and strike with greater strength. (30) civilizations developed, greater work efficiency came to be demanded, and (31) tools became more (32) . A tool would (33) a function until it proved (34) in meeting human needs, at which point an improvement would be made. One impetus for invention has always been the (35) for speed and high-quality results--provided they are achieved (36) reasonable costs. Stone pebbles were sufficient to account for small quantities of possessions, (37) they were not efficient enough for performing sophisticated mathematics. However, beads arranged systematically evolved into the abacus. The (38) of this tool can be (39) to the development of commerce in the East around 3000 B.C., and the abacus is known (40) by the ancient Babylonians, Egyptians, Chinese, etc.

单选题If the existing rules are retained, the 20 per cent of decisions that now require ______ agreement will prove far harder to reach.

单选题How ______ of you to remember my birthday!

单选题 In the past, falling oil prices have given a boost to the world economy, but recent forecasts for global growth have been toned down, even as oil prices sink lower and lower. Does that mean the link between lower oil prices and growth has weakened? Some experts say there are still good reasons to believe cheap oil should heat up the world economy. Consumers have more money in their pockets when they're paying less at the pump. They spend that money on other things, which stimulates the economy. The biggest gains go to countries that import most of their oil like China, Japan and India. But doesn't the extra money in the pockets of those countries' consumers mean an equal loss in oil-producing countries, cancelling out the gains? Not necessarily, says economic researcher Sara Johnson. 'Many oil producers built up huge reserve funds when prices were high, so when prices fall they will draw on their reserves to support government spending and subsidies (补贴) for their consumers.' But not all oil producers have big reserves. In Venezuela, collapsing oil prices have sent its economy into free-fall. Economist Carl Weinberg believes the negative effects of plunging oil prices are overwhelming the positive effects of cheaper oil. The implication is a sharp decline in global trade, which has plunged partly because oil-producing nations can't afford to import as much as they used to. Sara Johnson acknowledges that the global economic benefit from a fall in oil prices today is likely lower than it was in the past. One reason is that more countries are big oil producers now, so the nations suffering from the price drop account for a larger share of the global economy. Consumers, in the U.S. at least, are acting cautiously with the savings they're getting at the gas pump, as the memory of the recent great recession is still fresh in their mind. And a number of oil-producing countries are trimming their gasoline subsidies and raising taxes, so the net savings for global consumers is not as big as the oil price plunge might suggest.

单选题 Humor can also be a powerful ______ against stress and misfortune.

单选题Where is Dick?Do you think he’s reached home by now?He__________home for a while.

单选题Recently the car factory had to carry out personnel ______ because of financial trouble.

单选题People's behavior patterns must be ______ with their goals.

单选题A: Did you hear that I won first prize in the talent show? B: ______.

单选题Shanghai is one of ______ cities in the world. [A] big [B] the bigger [C] the biggest

单选题He was trained as a doctor but ______ to diplomacy. A. converted B. reverted C. diverted D. averted

单选题If ______ to speak, he has no problem expressing himself. A. asked B. asking C. ask D. to be asked

单选题Any earthquake that takes place in any area is certainly regarded as a kind of a ______ event.

单选题The ______ friend was exposed in the end to be hidden rival who had been plotting against the company's marketing in Hong Kong.

单选题Only her friends knew she had a(n) fatal illness, and her family was not informed.

单选题The little boy can not tell______. A．whose is that watch B．whose that watch is C．whose watch is that D．whose watch is

单选题 We welcome him not ______ as a new broom but rather as a very old friend.