单选题Although her research topic had been approved by her thesis advisor, the library persisted in ______ the documents.

单选题 Other guests (at) yesterday's opening, (which) was broadcast (alive) by the radio station, (included) the princess and her husband.

单选题The attack of the World Trade Center will leave a ______ impression on those who have witnessed the explosion.

单选题 The international situation has been growing ______ difficult for the last few years.

单选题Most teenagers in the United States try to make time for school , family and friends． But some choose bigger goals． Here are the stories of two American teens working to make a difference in the world

单选题 A. forecast B. flexible C. neutrally D. preference E. detach F. bound G. implement H. consequence I. qualified J. dismissing K. result L. occupying M. urgently N. skeptical O. response In the second half of the twentieth century, many countries of the South began to send students to the industrialized countries for further education. They 42 needed supplies of highly trained personnel to 43 a concept of development based on modernization. But many of these students decided to stay on in the developed countries when they had finished their training. In the 1960s, some Latin American countries tried to solve this problem by setting up special 'return' programs to encourage their professionals to come back home. These programs received support from international bodies such as the International Organization for Migration, which in 1974 enabled over 1, 600 44 scientists and technicians to return to Latin America. In the 1980s and 1990s, 'temporary return' programs were set up in order to make the best use of trained personnel 45 strategic positions in the developed countries. This gave rise to the United Nations Development Program's Transfer of Knowledge through Expatriate Nationals, which encourages technicians and scientists to work in their own countries for short periods. But the brain drain from these countries may well increase in 46 to the new laws of the international market in knowledge. Recent studies 47 that the most developed countries are going to need more and more highly qualified professionals around twice as many as their educational systems will be able to produce, or so it is thought. As a 48 there is an urgent need for developing countries which send students abroad to give 49 to fields where they need competent people to give muscle to their own institutions, instead of encouraging the training of people who may not come back because there are no professional outlets for them. And the countries of the South must not be content with institutional structures that simply take back professionals sent abroad; they must introduce 50 administrative procedures to encourage them to return. If they do not do this, the brain drain is 51 to continue.

单选题Ever since she was a little girl, she ______ interested in music.

单选题Children who are overprotected by their parents may become ______.

单选题The full ______ of changes in computer technology will be felt within the next few years. A. affect B. impact C. action D. importance

单选题I’ll lend you my computer ______ you promise to take care of it.

单选题It is always useful to have savings to ______.

单选题What you're ______ to read may challenge your assumptions about the kind of world we live in. A. around B. ahead C. above D. about

单选题When I saw the expression on his face, I realized he is ______ agreement with me.

单选题Scientists are searching for the oldest tree __________ because it can teach them a great deal about many issues related with climate change.

单选题Born of the same parents, he bears no ______ his brothers.

单选题This is a ______ table.

单选题The course normally attracts 20 students per year, ______ up to half will be from overseas. A. in which B. for whom C. with which D. of whom

单选题A big problem in learning English as a foreign language is a lack of opportunities for ______ interaction with proficient speakers of English.

单选题How does labor usually behave?