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单选(10分)孟子认为,人性修养的关键在于( )。
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[音频]An (1) ________ species of whale is experiencing a small-baby boom off the coast of America. The North Atlantic right whale is one of the (2)________ species of whale on the planet, numbering only about 411. But the Center for Coastal Studies said Friday that its aerial survey team (3)________ a mom with two babies in Cape Cod Bay a day earlier. That brings the number seen in nearby waters alone this year to three. That's big news because the whale (4)________ has been falling, and no baby whales were seen last year. In all, seven baby whales have been spotted so far this year. The whale population has become endangered due to (5)________ whaling activities in recent years. This is because they are sometimes hunted for their meat or their skin. Overhunting could lead to the (6)________ of the whale population, possibly causing major problems to the global food chain. The whales give birth off the southeast coast of America in the winter and travel to feeding grounds off the northeast coast in the early spring. Northeast coast is a (7)________ important source of food. The animals often feed close to shore. This provides watchers on land with “unbeatable views of one of the rarest of (8)________ mammals.” It’s illegal to get within 1,500 feet of the animals without a federal research (9)________, so whale watchers are discouraged from (10)________ to get close to the whales.
i表示空间的方向，直角坐标系下可以代表（）
i表示空间的方向，柱坐标系下可以代表（）
线弹性力学研究的变形特点有：变形（），变形和受力是（），和变形/受力路径（）
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