单项选择题

I greatly/regret that I'm unable to attend the important sales meeting next Monday.（）

A．我很后悔我没能专注于下周一的那个拍卖会。
B．我很遗憾我不能出席下周一那个重要的拍卖会。
C．我很遗憾下周一我参加不了销售会议。
D．我很遗憾我不能出席下周一那个重要的销售会议。

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单项选择题

We can infer from the speech of the study leader that（）

A．the research helps to answer really big questions about lightning
B．runaway breakdown is a mechanism that may play a role in gamma-ray flashes
C．the next research might be on "runaway breakdown"
D．the researchers have a lot to learn about how even small sparks work

单项选择题

According to the passage, scientists used to think that the X-rays were produced by（）

A．making sparks in laboratory
B．discharges of high-energy electron in the Sun, in exploding stars, and in lightning
C．electrons escaping their normal connections
D．radio waves