[单项选择]The high-tech revolution has inspired a seemingly endless stream of new and exciting electronic products that we just can’t live without. In fact, the dizzying speed of technological innovation can make last year’s must this year’s junk.
And that’s the problem. The average life span at personal computer has shrunk to around 19 months--and this has nothing to do with worn-out mice or damaged disk drives. Simply put, electronic products can become obsolete before you’ve even figured out how they work.
So what happens to all those old keyboards, monitors, organizers and CPUs Most are stashed away in the attic or forgotten in a corporate warehouse, taking up valuable space. But many end up in landfills, and that is where the trouble really begins.
Computer monitors can contain up to 3.5 kg of lead and can actually be considered hazardous waste once they are no longer in use. Circuit boards in electronic products contain cadmium(镉), chromium(铬) and mercury, all of whic
A. the issue of technological innovations
B. the necessity of updating computer hardware
C. the conservation of natural resources
D. the disposal problem of electronic products

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[单项选择]The high-tech revolution has inspired a seemingly endless stream of new and exciting electronic products that we just can’t live without. In fact, the dizzying speed of technological innovation can make last year’s must this year’s junk.
And that’s the problem. The average life span at personal computer has shrunk to around 19 months--and this has nothing to do with worn-out mice or damaged disk drives. Simply put, electronic products can become obsolete before you’ve even figured out how they work.
So what happens to all those old keyboards, monitors, organizers and CPUs Most are stashed away in the attic or forgotten in a corporate warehouse, taking up valuable space. But many end up in landfills, and that is where the trouble really begins.
Computer monitors can contain up to 3.5 kg of lead and can actually be considered hazardous waste once they are no longer in use. Circuit boards in electronic products contain cadmium(镉), chromium(铬) and mercury, all of whic
A. if buried in landfills
B. when put away in warehouses
C. once no longer in use
D. unless stashed with other appliances

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[填空题]Office revolution not only has changed how work is done but redefined the function of everyone who works in an office. A. not only B. how C. redefined D. works

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In recent years a new farming revolution has begun, one that involves the{{U}} (21) {{/U}}of life at a fundamental level — the gene. The study of genetics has{{U}} (22) {{/U}}a new industry called biotechnology. As the name suggests, it{{U}} (23) {{/U}}biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize{{U}} (24) {{/U}}agriculture and are working feverishly to duplicate seeds that give a high yield, that{{U}} (25) {{/U}}diseases, drought and frost, and that reduce the need for{{U}} (26) {{/U}}chemicals.{{U}} (27) {{/U}}such goals could be achieved, it would be most beneficial. But some have raised concerns about genetically engineered crops.
In nature, genetic diversity is created within certain space. A rose{{U}} (28) {{/U}}be crossed with a different ki
A. If
B. However
C. That
D. Unless

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