单项选择题

We almost ran into a Rolls-Royce that pulled out in front of us withoutsignaling.（）

A．overtook
B．hit
C．passed
D．found

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单项选择题

The liquid water of an underground pool of Europa is estimated xxxxx of the US Greatlakes.（）

A．Right
B．Wrong
C．Not mention

单项选择题

paragraph 2（）

A. what is theperiodic table 　　
B. What are noblegases
C. What causes the lowchemical reactivity of noble gases
D. How were noblegases discovered
E. How were noblegases understood in the past
F. what are theapplications of noble gases