单选题He is determined to consolidate his power.

单选题The president of the soccer association said that the two best teams might Umerge/U in the next month.

单选题We will take your recent illness into {{U}}consideration{{/U}} when marking your exams.

单选题The construction of the railway is said to have been terminated.A. resumedB. put an end toC. suspendedD. re-scheduled

单选题Major developmental thrusts, or "waves" as Alvin Toffler calls them, follow each other in succession, each adding a vital new Uaspect/U.

单选题The once barren hillsides are now good farmland.

单选题An old friend {{U}}called on{{/U}} me the day before yesterday.

单选题Our statistics show that we consume all that we are capable of producing. A．waste B．buy C．use D．sell

单选题The price of vegetables fluctuates according to the weather.

单选题Man cannot {{U}}exit{{/U}} without water

单选题The project required ten years of diligent research.

单选题Making Light of Sleep All we have a clock located inside our brains. Similar to your bedside alarm clock, your internal clock 1 on a 24-hour cycle. This cycle, 2 a circadian (昼夜节奏的，生理节奏的) rhythm, helps control when you wake, when you eat and when you sleep. Somewhere around puberty (青春期), 3 happens in the timing of the biological dock. The clock pushes forward, so adolescents (青少年) and teenagers are unable to fall asleep as early as they 4 to. When your mother tells you it"s time 5 bed, your body may be pushing you to stay up for several hours more. And the light coming from your computer screen or TV could be pushing you to 6 even later. This shift is 7 for teenagers. But staying up very late and sleeping late can get your body"s clock out of sync (同步) with the cycle of light and dark. It can also make it hard to get out of bed in the 8 and may bring other problems, too. Teenagers are put in a kind of gray cloud 9 they don"t get enough sleep, says Mary Carskadon, a sleep researcher at Brown University in Providence, RI. It 10 their mood and their ability to think and learn. But just like your alarm clock, your internal clock can be reset. In fact, it 11 resets itself every day. How? By using the light it gets through your 12 . Scientists have known for a long time that the light of day and the dark of night 13 important roles in setting our internal clocks. For years, researchers thought that the signals that synchronize the body"s 14 were handled through the same pathways that we use to see. 15 recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether it"s day or night.

单选题Compared to common electrical conductors, superconductors

单选题The discovery was {{U}}sensational{{/U}}. A. sexy B. surprising C. exceptional D. exciting

单选题I am always conscious of my own shortcomings.

单选题It is laid down in the regulations that all members must carry their membership cards at all times.

单选题下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Cell Phone Lets Your Secret Out Your cell phone holds secrets about you. Besides the names and {{U}}(51) {{/U}} that you've programmed into it, traces of your DNA linger(逗留) on the device, according to a new study. DNA is genetic(遗传的) material that {{U}}(52) {{/U}} in every cell. Like your fingerprint, your DNA is unique to you {{U}}(53) {{/U}} you have an identical twin. Scientists today routinely analyze DNA in blood, saliva(涎，唾液), or hair left {{U}}(54) {{/U}} at the scene of a crime. The results often help detectives identify {{U}}(55) {{/U}} and their victims. Your cell phone can reveal more about you {{U}}(56) {{/U}} you might think. Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the {{U}}(57) {{/U}} This made her wonder whether traces of DNA lingered on cell phones -- even when no blood was involved. {{U}}(58) {{/U}} she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones(翻盖手机) of 10 volunteers. They used swabs(药签) to collect {{U}}(59) {{/U}} traces of the users from two parts of the phone: the outside, where the user holds it, and the {{U}}(60) {{/U}}, which is placed at the user's ear. The scientists scrubbed(用力擦洗；擦净) the phones using a solution made mostly {{U}}(61) {{/U}} alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones {{U}} (62) {{/U}} for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that {{U}}(63) {{/U}} to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. {{U}}(64) {{/U}}, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the {{U}}(65) {{/U}} of clues that can clinch(确定，决定) a crime-scene investigation.

单选题The priest failed to build the boat because

单选题 Being thin or not No woman can be too rich or too thin. This saying often attributed to the late Duchess of Windsor embodies much of the odd spirit of our times. Being thin is deemed as such a virtue. The problem with such a view is that some people actually attempt to live by it. I myself have fantasies of slipping into narrow designer clothes. Consequently, I have been on a diet for the better-or worse-part of my life. Being rich wouldn't be bad either, but that won't happen unless an unknown relative dies suddenly in some distant land, leaving me millions of dollars. Where did we go off the track? When did eating butter become a sin, and a tittle bit of extra flesh unappealing, if not repellent? All religions have certain days when people refrain from eating, and excessive eating is one of Christianity's seven deadly sins. However, until quite recently, most people had a problem getting enough to eat. In some religious groups, wealth was a symbol of probable salvation and high morals, and fatness a sign of wealth and well-being. Today the opposite is true. We have shifted to thinness as our new mark of virtue. The result is that being fat-or even only somewhat overweight-is bad because it implies a lack of moral strength. Our obsession with thinness is also fueled by health concerns. It is true that in this country we have more overweight people than ever before, and that, in many cases, being overweight correlates with an increased risk of heart and blood vessel disease. These diseases, however, may have as much to do with our way of life and our high-fat diets as with excess weight. And the associated risk of cancer in the digestive system may be more of a dietary problem-too much fat and a lack of fiber-than a weight problem. The real concern, then, is not that we weigh too much, but that we neither exercise enough nor eat well. Exercise is necessary for strong bones and both heart and lung health. A balanced diet without a lot of fat can also help the body avoid many diseases. We should surely stop paying so much attention to weight. Simply being thin is not enough. It is actually hazardous if those who get (or already are) thin think they are automatically healthy and thus free from paying attention to their overall life-style. Thinness can be pure vain glory.

单选题It can be inferred from the passage that kerosene was preferable to whale oil because whale oil was too_______.