问题
单项选择题
心功能不全早期的应激反应是
A．心室肥厚
B．心室扩张
C．交感神经系统-肾素-血管紧张素系统活性和血管加压素水平增高
D．回心血量增加
E．大量分泌心房肽
答案
参考答案：C
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心功能不全早期的应激反应是
A．心室肥厚
B．心室扩张
C．交感神经系统-肾素-血管紧张素系统活性和血管加压素水平增高
D．回心血量增加
E．大量分泌心房肽
参考答案：C
It’s very important that we all recycle (再利用). In nature, everything ___26___ again. For example, when an animal dies, it becomes ___27____ animal’s food. Nothing is wasted. But humans have created things like plastic bags ___28___ can’t be broken down by nature. Our rubbish kills animals and __29___ water and soil. ___30___ we continue making too much rubbish, the problem will only get worse. If nature can’t reuse the rubbish, we must recycle __31__. We should clean up the rubbish we’ve made because nature can’t. Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees, __32 __ these materials are not endless. We use up our natural materials much _ _33 __ than the earth is able to reproduce them. For example, each year we cut __34 __ more that 6,000 square miles of forest. But it takes an average of 25 years for a new tree __35__. Recycling can help us save the earth, so let’s take action right now.
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