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  3. It’s well known that big animals, like polar bears, are sensitive to climate

It’s well known that big animals, like polar bears, are sensitive to climate

游客2023-07-11  29
问题     It’s well known that big animals, like polar bears, are sensitive to climate change. The Earth warms, polar ice【B1】______, and the bears are out of luck. The same goes for tigers, sea lions, elephants. As the globe【B2】______ up and natural environments change, all big【B3】______are potentially at risk.
    But what about insects? Some may be able to【B4】______just about anywhere. But most insects are just as sensitive to climate change as their larger, more beloved animal【B5】______.
    What’s more, insects are【B6】______ more important than large mammals, environmentally speaking. While several thousand polar bears wander the arctic, untold billions of insects live in【B7】______everywhere on Earth. And they’re【B8】______ in every ecosystem. For example, many of the world’s crops and other plants rely on insects for pollination(授粉).【B9】______. And there are the animals, like birds, that feed on insects.
    So how exactly will global warming affect insects? We don’t really know. Some may go extinct. 【B10】______. And this could have all sorts of important implications for crops and entire ecosystems.
    【B11】______, they’re particularly sensitive to climate change. It’s hard to predict what will happen to insects as the Earth warms. But it looks like we’re about to find out. [br] 【B8】
选项
答案 essential
解析 根据空格前面的they’re，可知此处需要一个形容词作表语。essential“必需的”。
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