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单项选择题

A. What was not realized in those early years was that birds have muscles very much stronger, in proportion to their size, than men.B. Experiments were carried out in many countries, sometimes with models driven by steam engines, but these were too heavy to be used in an airplane with a pilot.C. Professor Smith has been invited to give us a lecture on how to choose our favorite career.D. When you go out shopping and your child asks for something, buy a book. They’re cheaper than toys and a far better investment in your child’s future.

当你出去购物孩子要你买东西时，你就给他买本书。书比玩具便宜，且对孩子的未来是更好的投资。
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