单选题Let me reiterate my point.

单选题In Tokyo trading today the U.S. dollar fell and Japanese ______ dropped to their lowest level in three months. A. dealers B. shares C. standards D. ballots

单选题She is so ______ that she cried for days when her pet rabbit died. [A] sensitive [B] sensible [C] sensory [D] senseless

单选题In his most famous play, a couple's ______ marriage is centered on the fantasy child they have created. A. tempestuous B. rumble C. roaring D. tumultuous

单选题The custom is ______ in the belief that a new pregnancy—through its detrimental effect on breastfeeding—would endanger the mother's health.

单选题A scientific law is liable at anytime to need ______, that is an eternal truth.

单选题The verb "tell" in the sentence "I could tell that he was shy" (Paragraph 3) means ______

单选题It is A(estimated) that a scientific principle has B(a life expectancy) of approximately C(a decade) before D(it drastically) revised or replaced by newer information.

单选题It would be more effective to persuade the teenager smokers to give up smoking if ______.

单选题If you are a fan of science fiction, you've no doubt encountered the term nanotechnology. Yet over the past year also, a series of breakthroughs have transformed nanotech from sci-fi fantasy into a real world. Applied science, in the process, inspired huge investments by business, academia, and government. In industries as diverse as health care, computers, chemicals, and aerospace, nanotech is overhauling production techniques, resulting in new and improved products, some of which may already be in your home or workplace. The inspiration for nanotech goes back to a 1959 speech by the late physicist Richard Feynman, then a professor at the California Institute of Technology, titled "There's Plenty of Room at the Bottom. " Four decades later, Chad Mirkin, a Chemistry professor at Northwestern University's $ 34 million nanotech center, used a nanoscale device to etch most of Feynman's speech onto a surface the size of about 10 tobacco smoke particles. What accounts for the sudden acceleration of nanotechnology? A key breakthrough came in 1990, when researchers at IBM's Almaden Research Center succeeded in rearranging individual atoms at will. Using a device known as a scanning probe microscope, the warn slowly moved 35 atoms to spell the three-letter IBM logo, thus proving Feynman right. The entire Logo was less than three nanometers. Soon, scientists were not only manipulating individual atoms but "spray painting" with them as well. Using a tool known as a molecular beam epitary, scientists have learned to create ultra fine films of specialized crystals, built up one molecular layer at a time. This is the technology used today to build read-head components for computer hard drives. The next stage in the development of nanotechnology borrows a page from noture. Building a supercomputer no bigger than a speck of dust might seem an impossible task, until one realizes that evolution solved such problems more than a billion years ago. Living cells contain all sorts of anisole motors made of proteins that perform myriad mechanical and chemical functions, from muscle contraction to photosynthesis. In some instances, such motors may be re-engineered, or imitated, to produce products and processes useful to humans. How are these biologically inspired machines constructed? Often, they construct themselves, manifesting a phenomenon of nature known as self assembly. The macromolecules of such biological machines have exactly the right shape and chemical binding preferences to ensure that when they combine they will snap together in predesigned ways. For example, the two strands that make up DNA's double helix match each other exactly, which means that if they are separated in a complex chemical mixture, they are still able to find each other easily.

单选题The wreckage of the exploded car ______ the traffic.

单选题Although most dreams apparently happen ______, dream activity may be provoked by external influences. A. spontaneously B. simultaneously C. homogeneously D. instantaneously

单选题What things in life aye you most desirous ______ attaining? A. to B. for C. with D. of

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单选题Some 121 countries may be designated "developing", and of this 121, seventeen countries ______ more than four-fifths of energy consumption.

单选题Why are some of us good at math, or writing, while others ______ at art or basketball?(2002年上海交通大学考博试题)

单选题A It can be argued that the problems, even something B as fundamental as the C ever-increased world population, D have been caused by technological advance.

单选题The drunkenness in this area is a(n) ______of the despair felt by the people there.

单选题Living with a roommate ______ constraint on her, she couldn't play her trumpet or have parties late at night. A. imposing B. illustrating C. impressing D. leaving