Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build war ships, with which to gain itself an empire. It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home-country found itself faced by flood and starvation.
(77) Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this. The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees. (78) So, unless the government has a good system of control, or can educate the people, the forests will slowly disappear.
This does not only mean that the villagers' children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up allowing the rain to sink in—and also bind the soil, thus preventing its being washed away easily but where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.
What is the most important function of trees?
A.Providing fuel.
B.Offering shade.
C.Preventing natural disaster.
D.Providing wood.
第1题
A、急性结膜炎
B、溃疡性睑缘炎
C、眦部睑缘炎
D、泪小管炎
E、睑腺炎
第2题
A、慢性泪囊炎
B、新生儿急性泪囊炎
C、泪腺炎
D、结膜炎
E、睑缘炎
第3题
A、慢性泪囊炎
B、新生儿急性泪囊炎
C、泪腺炎
D、结膜炎
E、睑缘炎
第4题
B、泪腺炎
C、急性泪小管炎
D、急性泪囊炎
E、慢性泪囊炎
F、玻璃体混浊
问题:患者最佳的治疗方案是()A、应用抗生素注射液冲洗泪道
B、滴用抗生素滴眼液
C、暂停白内障手术,继续滴用抗生素滴眼液
D、立即行泪点栓塞及白内障手术
E、应用抗生素注射液冲洗泪道后,行白内障手术
F、暂停白内障手术,首先治疗炎症
患者行泪囊碘油造影提示泪囊明显萎缩,余无异常。该患者既往有心脏病史,遇惊吓、疼痛时,出现一过性的心绞痛。 问题:对患者实施的最佳手术方案是()A、泪囊鼻腔吻合术
B、泪囊摘除术
C、泪道探通术
D、泪道激光术
E、人工泪管植入术
F、泪小点切开术
患者行泪囊手术后1年,术后下眼睑间歇性红肿,鼻侧结膜充血,压迫下睑内侧可见少量脓性分泌物溢出,泪小点水肿。 问题:根据患者术后的眼部表现,目前该患者最可能的诊断是()A、急性结膜炎
B、溃疡性睑缘炎
C、眦部睑缘炎
D、泪小管炎
E、睑腺炎
F、泪囊切除不全
第5题
A.单纯疱疹病毒性睑皮炎
B. 带状疱疹病毒性睑皮炎
C. 外睑腺炎(麦粒肿)
D. 睑板腺囊肿(霰粒肿)
E. 接触性皮炎
第6题
A.睑板腺囊肿
B.外睑腺炎
C.鳞屑性睑缘炎
D.眼眶肿瘤
E.眼眶蜂窝织炎
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