单选题You should keep the milk in the ice box, ______ it will go bad.

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单选题When it ______ maths, I might as well keep silent.

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单选题Incomes in these countries are very unequally ________ , with a few very rich and many very poor people.

单选题(C) If one takes a sample of the element gold and starts breaking it into smaller and smaller and smaller pieces, it seems reasonable that one will eventually (最终) reach a "smallest possible piece" of gold that could not be divided further and still be called gold. This smallest possible unit of gold would be a gold atom. Thus, the atom is the limit of chemical subdivision for an element. The concept of an atom is an old one, dating back to ancient Greece. Records indicate that around 460 B.C., Democritus, a Greek philosopher, suggested that continued subdivision of matter ultimately would yield small indivisible particles which he called atoms (from the Greek word atomos meaning "uncut or indivisible"). Democritus"s ideas about matter were, however, lost (forgotten) during the Middle Ages, as were the ideas of many other people. It was not until the beginning of the nineteenth century that the concept of the atom was "rediscovered". John Dalton (1776--1844), an English school teacher, proposed in a series of papers published in the period 1803--1807 that the fundamental building block for all kinds of matter was an atom. Dalton"s proposal had as its basis experimentation that he and other scientists had conducted. This is in marked contrast to the early Greek concept of atoms, which was based solely on philosophical speculation (构想). Because of its experimental basis, Dalton"s idea got wide attention and stimulated new work and thought concerning the ultimate building blocks of matter. Additional research, carried out by many scientists, has now validated (证明……有效) Dalton"s basic conclusion that the building blocks for all types of matter are atomic in nature. Some of the details of Dalton"s original proposals have had to be modified in the light of recent more sophisticated experiments, but the basic concept of atoms remains.

单选题By the time students complete that course they know two computer languages and have no trouble ________ their own programs.

单选题When a rare disease ALD threatened to kill the four-year-old boy Lorenzo, his parents refused to give up hope. Doctors explained that there was no cure for ALD, and that he would probably die within three years. But Lorenzo"s parents set out to prove the doctors wrong. The parents devoted themselves to keeping their son alive and searching for a cure. But doctors and the families of other ALD patients often refused to take them seriously. They thought the efforts to find a cure were a waste of time, and drug companies weren"t interested in supporting research into such a rare disease. However, the parents still refused to give up and spent every available hour in medical libraries and talking to anyone who would help. Through trial and error, they finally created a cure from ingredients (调料) commonly found in the kitchen. The cure, named "Lorenzo"s Oil", saved the boys life. Despite the good results, scientists and doctors remained unconvinced. They said there was no real evidence that the oil worked and that the treatment was just a theory. As a result, some families with ALD children were reluctant to try it. Finally, the boy"s father organized an international study to test the oil. After ten years of trials, the answer is: the oil keeps ALD children healthy.

单选题Duty is an act or a course of action that people ______ you to take by social customs, law or religion.

单选题He started his career ______ a painter.

单选题It"s true that not having a ear imposes some ______, but owning one also complicates life in many ways.

单选题Some people would like to do shopping on Sundays since they expect to pick up a lot of wonderful ______ in the markets.

单选题When he wrote to his father that he wanted to ______ his education and get married, his father cut off his allowance.

单选题Humor is a most ______, yet frequently neglected means of handling the difficult situations in our lives.

单选题With regard to this model of color TV sets, the home-made ones are by no means ______ those made in Japan.

单选题In January this year we placed the order for plastic containers. The deadline of March 31 has now passed and there is still no information of when delivery is to be expected. Please reply immediately with reasons for delay and inform us of when and how the goods will be shipped. If we do not hear from you, we shall have to cancel the order.

单选题Upon hearing that piece of music, my angry ________ was gradually replaced by one of peace.

单选题He didn"t thank me for the present. That is ______ annoyed me.

单选题We asked the girl ______ a tractor if she could tell us how to get to the farm.

单选题Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.