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问题 单项选择题

四岁儿童，因发现龋齿就诊。检查发现右下第二乳磨牙近中邻面深龋，腐质未去净露髓，疼痛。应考虑的处理方法

A．直接盖髓

B．冠髓切断

C．根管治疗

D．干髓术

E．姑息治疗

答案

参考答案：C

解析：距离换牙期尚早的乳牙，牙髓感染时可采取根管治疗的方法。

选择题

西方大国普遍采取这样的措施处理经济问题，即把40%的国有企业出售给私人，削减住房、医疗、失业等各种社会福利开支，减少税收，提高利率。这是为了[ ]

A．促进工业革命后经济的发展

B．克服20世纪30年代的经济危机

C．解决二战后初期的经济困难

D．缓解20世纪70年代的经济“滞胀”
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填空题


A patrol team of sea lions and dolphins featured in a large-scale military exercises being conducted by the U. S. and its allies in the Pacific Ocean. The machine (1) took part in simulated mine recovery and mine detection missions during the biennial Rim of the Pacific Exercise (RIMPAC) war games. The (2) started on June 19 and will run (3) Friday.
"There are a number of mechanical systems that work in those areas. (4) high-tech gadgets deployed by the military can’t (5) the natural skills of dolphins and lions," said Tom Lapuzza, spokesman for UN Navy’s Marine Mammal Program. Sea lions have "incredible good underwater (6) " and can dive down to 300 meters to catch a recovery line to a mine, he said. Dolphins use sonar to (7) mine.
Human beings have a long (8) of training animals to join the military. Horses have been the most widely-used animals (9) the recorded history of (10) . In early times, horses were used to (11) chariots or to (12) armored forces. With the development of modem weapons and motorized (13) , the use of horses for military purposes fell into (14) . (15) , horses were still used (16) by the German army during World War II for transporting (17) and equipment, including artillery.
During World War II, (18) with explosives strapped to their backs were used as anti-tank weapons. In other (19) , they were used for detecting mines. Some dogs were also used as messengers.
Other animals have also (20) in the military. Recorded history shows the use of elephants for military purposes as early as 1,100 B. C.. They were employed during World War II by both the Japanese army and the (21) .
There are records showing that over 100,000 reindeer were used by Finland to tow sleds during World War II. They carried the (22) to hospitals, brought supplies to the troops and moved heavy anti-tank weapons. It is well documented that oxen have been (23) used in war as improvised beasts of burden. During World War II, spiders were employed by the Allies to spin silk for (24) in cross-hairs on bomb scopes and other optical instruments. People also are finding that Vampire bats’ ability to use echolocation is very interesting as we (25) to learn how it works and it may benefit the army.
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