友谊需要滋养。有的人用钱，有的人用汗，还有的人用血。友谊是很贪婪的，绝不会满足于餐风饮露。友谊是最简朴同时也是最奢侈的营养，需要用时间去灌溉。友谊必须述说，友谊必须倾听，友谊必须交谈的时刻双目凝视，友谊必须倾听的时分全神贯注。友谊有的时候是那样脆弱，一句不经意的言辞，就会使大厦顷刻倒塌。友谊有的时候是那样容易变质，一个未经证实的传言，就会让整盆牛奶变酸。这个世界日新月异。在什么都是越现代越好的年代里，唯有友谊，人们保持着古老的准则。朋友就像文物，越老越珍贵。
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The authors attitude toward Dr. Schweitzer and Dr. Goodwins speculation on the possibility
A. skeptical.
B. supportive.
C. indifferent.
D. optimistic.
Researchers conducted an experiment using freshly slaughtered ostriches to prove that
A. soft tissues pre-soaked in blood and put in saline solution won"t disappear.
B. reactive ions interact with organic tissues to form. abnormal chemical bonds.
C. iron from blood cells has great influence on the preservation of animal tissues.
D. proteins tied in knots are unrecognizable to bacterias that would consume them.
We can infer from the last two paragraphs that
A. dinosaurs" DNA was not replicated in the fiction world of "Jurassic Park".
B. DNA disappears in about 1,000 years and can"t be found in fossils.
C. iron nanoparticles can help the DNA to last longer than 521 years.
D. iron might play a critical role in keeping DNA in the animal fossils.
According to the passage, scientists havent had any doubt about a palaeontological doctrine that
A. animal bodies tend to be destroyed by different elements.
B. some corpses of animals turn into preserved rock formation.
C. minerals from underground water form. organic material.
D. the remains of animals are usually covered by sediment.
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