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试述辩证否定观的内容，并用以说明应怎样正确对待我国的文化遗产和外国文化。

Space is a dangerous place,not only because of meteors but also because of rays from the sun?and other stars.The atmosphere again acts as our protective blanket on earth.Light gets through,and?this is essential for plants to make the food which we eat.Heat,too,makes our environment endurable.Various kinds of rays come through the air from outer space,but enormous quantities of radiation from the sun are screened off.As soon as men leave the atmosphere they are exposed to this radiation.But their spacesuits or the walls of their spacecraft,if they are inside,do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in space.The unit of radiation is called"rein".Scientists have reason to think that a man can put up with far more radiation than 0.1 rem?without being damaged;the figure of 60 rems has been agreed on.The trouble is that it is extremely?difficult to be sure about radiation damage—a person may feel perfectly well,but the cells of his or?her sex organs may be damaged,and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren.Missions of the Apollo flights have had to cross belts of high radiation?and,during the outward and return journeys,the Apollo crew accumulated a large amount of rems.So?far,no dangerous amounts of radiation have been reported,but the Apollo missions have been quite?short.We simply do not know yet how men are going to get on when they spend weeks and months?outside the protection of the atmosphere,working in a space laboratory.Drugs might help to decrease?the damage done by radiation,but no really effective ones have been found so far.

According to the first paragraph,the atmosphere is essential to man in that__________.

A.it protects him against the harmful rays from space
B.it provides sufficient light for plant growth
C.it supplies the heat necessary for human survival
D.it screens off the falling meteors

请在第_____处填上正确答案。

A.enemy
B.election
C.memory
D.opponent

胡某是甲动物园大猩猩馆的员工。某日，游客乙携5岁小孩丙前往动物园参观大猩猩馆。在大猩猩馆旁边竖有警告牌“禁止拍照”“请不要将小孩举高高”。但由于胡某当时上厕所不在岗位，乙便将丙高高举起，让丙给大猩猩拍照。大猩猩因受刺激，将排泄物扔向丙，致乙、丙摔伤。就上述案情，下列说法中，正确的有：( ）

A.由胡某承担赔偿责任，因胡某未尽到注意义务
B.由胡某与乙共同承担，因胡某未尽到注意义务，乙也未尽到监护职责
C.由甲动物园承担责任，因为甲动物园为雇主
D.由甲动物园和小孩父母共同承担，因甲动物园是雇主，同时乙未尽到监护职责