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题型：单选题题类：模拟题难易度：普通

We couldn't connect Malaysia MH370 _______ Mar 8^th, 2014.

A、on B、 to C、at D、of

举一反三

Ice-cream good, but it's not good our health.

–Why are Chinese tigers becoming _______?

–Because people kill them _______ their fur and bones.

—One is never ______ old ______ learn. Do you think so?

—Yes. I agree.

The "teacher-free exam" means that students take their exams ___________ teachers. Students must be more honest.

Now people can work and communicate with others easily ____________ the Internet.

_______ weekdays, I usually have breakfast at 6: 45 in the morning.

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