[单项选择]Physicists have made new discoveries that challenge our（）theories of the universe.
A. existed
B. adapted
C. accepted
D. established

[单项选择]Who have made the new plan to change the sanctions program against Iraq
A. The United States.
B. Britain.
C. China.
D. Russia.

[单项选择]

Science and new technology have made such rapid progress in agriculture that modern machines can do almost all farm work, and therefore have made it possible for farmers to pro- duce more food on the same amount of land. When people live in plenty, vegetables and fruits are becoming more and more popular. As a result more and more vegetables and fruits are in greater need.
Can orchard workers harvest fruits with machines as farmers to crops Yes, they can. Scientists have already invented many different fruit-harvesting machines. Now, let’s take cherry picking machine for example. The cherry-picking machine first shakes a cherry tree, then catches cherries in heavy sheets and pushes the fruit along belts. The cherries are then dropped into huge containers of water, in which they are washed clean, and look fresh and pretty when they are placed into plastic boxes which come along the belt one after another. All this work is finished within three minutes. In this way tw
A. Science, New Technology and Agriculture
B. Development of Science and New Technology Has Improved Agriculture
C. Orchard Workers Are Interested in the Development of Science and New Technology
D. Science and New Technology Can Enrich a Country

[填空题] Researchers in Troy, New York, have made the world’’s smallest brushes, with bristles a thousand times thinner than a human hair. They’’re (36)________to sweep clean the tiny world of nanotechnology. Brushes, brooms and hairy fly swats are probably among the first tools (37)________ by humans. (38)________, an ancient paintbrush used by a prehistoric cave artist (39)________ from 30,000 years ago. So it’’s (40)________ that miniature versions of these should adorn the burgeoning field of nanotechnology. The bristles of these new nanobrushes are made of tiny (41)________ filaments thirty billionths of a meter across and a few (42)________long. The brush handles they’’re attached to are comparatively large — (43)________ than a human hair! The researchers have taken microscope pictures (44)________________________—particles that would escape any normal brush. The researchers also used their brushes to paint microstructures; and (45) ________________________. If the tin