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题型：单选题题类：常考题难易度：容易

—The earthquake last night was really terrifying.
— , no people were injured or killed, and they escaped in time.

A、Luckily B、Hopefully C、Sadly D、Unfortunately

举一反三

There was such a long queue for coffee at the interval that we gave up.

—Are you worried about his safety?

—Only ______.

I'm really sorry. I can't go to the cinema with you. I am tired.

For all the failure of his business, he remains optimistic and ____untroubled by his problems.

Though scientists get closer to understanding why we age, the reason for different aging rates among individuals remains only __________ understood.

We should take the problem .

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