The study of genetics has given rise to a profitable new Industry called biotechnology. As the name suggests, it blends biology and modern technology through such techniques as genetic engineering. Some of the new biotech companies, as they are called, specialize in agriculture and are working enthusiastically to patent seeds that give a high yield, that resist disease, drought, and frost, and that reduce the need for hazardous chemicals. If such goals could be achieved, it would be most beneficial. But some have raised concern about genetically engineered crops.
"In nature, genetic diversity is created within certain limits, " says the book Genetic Engineering, Food, and Our Environment. "A rose can be crossed with a different kind of rose, but a rose will never cross with a potato..." Genetic engineering, on the other hand, usually involves taking genes from one species and inserting them into another in an attempt to transfer a desired property or c
A. the species of creatures will be reduced.
B. we will suffer from fewer and fewer diseases.
C. our living environment will be better than it is now.
D. humans will pay for its side effect.
男性，20岁，既往体健，外伤致多处骨折，3天后，呼吸困难4小时，呼吸频率40次／分，脉搏130次／分，BP140/80mmHg。血气务析：pH7.28，PaCO234mmHg，Pao240mmHg，HC0-2160mmol／L，最可能的诊断为（）
| A scientific panel convened by the
World Health organization recommended guidelines on Friday for doctors
conducting clinical studies of SARS patients. The panel urged doctors to apply
the guidelines in analyzing the masses of potentially useful information about
various therapies that were collected in this year’s epidemic. Much of that
information has not been published or analyzed. "It is a matter of urgency to get better analysis and review," said Dr. Simon Mardel, a WHO official who led the two-day meeting that ended on Friday. He said thousands of potential therapies and compounds had been tested so far as researchers try to determine treatments for SARS, or severe acute respiratory syndrome. "We recognize that having no treatment for SARS is hind A. SARS, a Dreadful Disease. B. No Good Methods to Treat SARS. C. SARS Will Return one Day. D. Health Panel Recommends New Guidelines on SAR$. [单选题][266]【图片】
A. 黑色端代表正极 B. 黑色端代表负极 C. 不分正负极 D. 以上描述都不对 [单选题]生产工艺用热属于常年性热负荷，常年性热负荷的特点是?
A.主要取决于室外气候条件 B.与室外气候条件有关，但不是主要原因，主要取决于生产状况 C. 取决于生产状况 D.与室外气候条件无关 [单项选择]下列桥台中属于拱桥轻型桥墩的有（ ）。
A. 混凝土薄壁桥墩 B. 柱式桥墩 C. 钻孔桩柱式桥墩 D. 带三角杆件的单向推力墩 [填空题]保持发电机输出频率恒定的方法有两种：①（），采取失速调节或者混合调节的风力发电机，以恒转速运行时，主要采用（）；②（），用（）将发电机发出的频率变化的电能转化成频率恒定的电能。
[简答题]扑救危险化学品仓库火灾的注意事项有哪些?
[单项选择]适合种子干藏的的园林植物是（）。
A. 美人蕉 B. 羊蹄甲 C. 银杏 D. 油茶 [单选题]雷达生命探测仪连续工作时间不少于( )(中)
A.1h B. 3h C.6h D.12h 我来回答: 提交
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