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问题 单项选择题

诊断急性白血病必须具备（）。

A.发热、贫血及出血

B.白细胞计数显著增高

C.胸骨压痛伴肝脾增大

D.骨髓增生极度活跃

E.骨髓中原始及幼稚细胞比例明显增高

答案

参考答案：E

解析：骨髓象是白血病的确诊依据。急性白血病可见骨髓增生活跃、明显或极度活跃。原始细胞增多，成熟细胞极少见。

单项选择题

人事部、国家安全生产管理总局于( )发布了《注册安全工程师执业资格制度暂行规定》。

A．2001年9月3日

B．2001年10月3日

C．2002年9月3日

D．2002年10月3日
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单项选择题

Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.

Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\

5（）

A. others

B. the others

C. other

D. the other
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