单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．They often take risks.
B．They’re too conservative.
C．They have no sense of security.
D．They have no self-discipline.
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单项选择题
When NASA was set up, its research and advancements were prescribed to benefit ______.
A．space travel
B．national security
C．people’s welfare
D．economic development
问答题
人类面临的环境问题越来越多，如气候变化、环境污染、生态失衡等问题 2．但许多人仍然不懂得去保护环境 3．我的看法 On the Importance of Environmental Protection __________________ __________________ __________________
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