单项选择题

According to the author, ______.

A．Europeans are more intelligent than Africans and Asians
B．there is no such things as mental superiority
C．Europeans should share their knowledge with Africans and Asians
D．mental superiority is vital to the scientific progress in Europe

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单项选择题

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

单项选择题

The harm radiation has done to the Apollo crew members ______.

A．is insignificant
B．seems overestimated
C．is enormous
D．remains unknown