赞题库-背景图
单项选择题

The phrase "stumbling block" may best refer to ______.

A．obstacle
B．motivation
C．acceleration
D．deceleration
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热门试题

单项选择题According to the passage, which may be the best title

A．Storing Used Nuclear Fuel
B．Dealing with Nuclear Waste
C．Renewable Nuclear Power
D．Environment and Resources

单项选择题By the first sentence of the passage the author means the US scientists______.

A．at large
B．at best
C．well-paid, but less productive
D．well-funded, but less informed