单选题Which of the following is wrong about wedding cakes mentioned in this message?

单选题Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column. The column is designed so that a single pollination will fertilize hundreds of thousands, and in some cases millions, of seeds, so microscopic and light that they are easily carried by the breeze. Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted into gorgeous, weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator. To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects or birds. Some orchids even change their scents to interest different insects at different times. Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does not leave until pollen has been accurately placed or removed. By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same time they have made themselves irresistible to collectors.

单选题The definition "the act of using, or promoting the use of, several languages, either by an individual speaker or by a community of speakers" refers to [A] Pidgin. [B] Creole. [C] Multilingualism. [D] Bilingualism.

单选题You will hear three dialogues or monologues. Before listening to each one, you will have time to read the questions related to it. While listening, answer each question by choosing A, B, C or D. After listening, you will have time to check your answer. You will hear each piece once only.

单选题Which statement is TRUE concerned with ears in the future?

单选题It can be interred from the article that an inertial guidance system is similar to

单选题

单选题Questions 17—20 are based on the following text about flying. You now have 20 seconds to read Questions 17—20.

单选题As regards social conventions, we must say a word about the well known English class system. This is an embarrassing subject for English people, and one they tend to be ashamed of, though during the present century class-consciousness has grown less and less, and the class system less rigid. But it still exists below the surface. Broadly speaking, it means there are two classes, the "middle class" and the "working class". (We shall ignore for a moment the old "upper class", including the hereditary aristocracy, since it is extremely small in numbers; but some of its members have the right to sit in the House of Lords, and some newspapers take a surprising interest in their private life.) The middle class consists chiefly of well to do businessmen and professional people of all kinds. The working class consists chiefly of manual and unskilled workers. The most obvious difference between them is in their accent. Middle class people use slightly varying kinds of "received pronunciation" which is the kind of English spoken by BBC announcers and taught to overseas pupils. Typical working class people speak in many different local accents which are generally felt to be rather ugly and uneducated. One of the biggest barriers of social equality in England is the two class education system. To have been to a so called "public school" immediately marks you out as one of the middle class. The middle classes tend to live a more formal life than working class people, and are usually more cultured. Their midday meal is "lunch" and they have a rather formal evening meal called "dinner", whereas the working man's dinner, if his working hours permit, is at mid-day, and his smaller, late evening meal is called supper. As we have said, however, the class system is much less rigid than it was, and for a long time it has been government policy to reduce class distinctions. Working class students very commonly receive a university education and enter the professions, and working class incomes have grown so much recently that the distinctions between the two classes are becoming less and less clear. However, regardless of one's social status, certain standards of politeness are expected of everybody, and a well bred person is polite to everyone he meets, and treats a laborer with the same respect he gives an important businessman. Servility inspires both embarrassment and dislike. Even the word "sir", except in school and in certain occupations (e.g. commerce, the army, etc.) sounds too servile to be commonly used.

单选题According to the passage, it was once a common belief that urban residents______.

单选题

单选题[此试题无题干]

单选题As the U.S. government budget crisis enters the second week, there are concerns that the rivalry between Democrats and Republicans in Congress may bring the United States to default, which would cause domestic and global economic woes. The world is observing developments in the U. S. capital with bewilderment, as well as concerns. Republicans may allow default. The top Republican leader has signaled that he may allow the United States to default for the first time in history if President Barack Obama refuses a compromise on federal spending. The United States must increase its debt ceiling by October 17 to be able to pay for government debt already accrued. The president, a Democrat, said he is open to negotiation with the Republicans on any issue, but not amid such threats. "We"re not going to negotiate under the threat of further harm to our economy and middle class families. We"re not going to negotiate under the threat of a prolonged shutdown until Republicans get 100 percent of what they want," Obama said, "We"re not going to negotiate under the threat of economic catastrophe that economists and CEOs increasingly warn would result if Congress choose to default on America"s obligations." Devastating consequences: one analyst warned that a prolonged shutdown could have harmful effects on the U.S. economy. But he said the U.S. defaulting on its debt would be worse. Klaus Larres, a professor at the University of North Carolina, said the consequences would be disastrous for the world still recovering from a major financial crisis. What"s worse, debt ceiling problem should not be mixed up with the shutdown of the government. It could, in turn, undermine the U.S. Dollar"s position as the global reserve currency and even the U.S. role as the world"s strongest economy. International effects: other economies also could be affected. China is concerned about more than ＄1 trillion it has invested in the United States and is urging the United States to raise its debt ceiling. Larres said much of the world has difficulty understanding this U. S. crisis, especially countries with authoritarian governments, such as China and some other East Asian states. Larres said the effects of the U. S. government shutdown are still mild, and that with a timely solution, the situation could be quickly rectified. But he added a prolonged impasse and a deeper crisis could have a negative effect that could undermine the position of the United States as the world"s top political and economic leader.

单选题Which of the following is relational opposites? A. single vs married B. hot vs cold C. alive vs dead D. husband vs wife