卷行天下月考2023 答案

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One possible version:Dear schoolmates,Elephants are the largest mammals on land.They canlive as long as 80 years.However,these days the numberof elephants is becoming much smaller.Because people cutdown forests,they are losing their homes.Also,people killthem for their ivory.Elephants are in great danger.I thinkwe should try our best to protect them.First,we shouldhelp make rules to stop people from killing elephants.Sec-ond,we shouldn't cut down trees.Third,we shouldn'tbuy anything made of ivory.I believe everyone's contribution can make a bigdifference.

5.B【解析】运动员在剧烈运动时，葡萄糖消耗增加，血糖降低，刺激胰岛A细胞分泌胰高血糖素促进肝糖原分解，加速体内非糖物质的转化，从而使血糖浓度升高，A错误；运动员大量出汗，失水过多，细胞外液渗透压升高，下丘脑渗透压感受器受到刺激，垂体释放抗利尿激素增多，B正确；由题干信息可知，肾素在血浆中参与激活血管紧张素，通过血管紧张素对心血管发挥作用，说明肾素通过体液运输，间接调节心血管细胞的生理活动，C错误；交感神经末梢释放的去甲肾上腺素就是神经递质，神经递质由突触前膜释放，在突触间隙通过扩散到达突触后膜，并与其突触后膜上的受体结合，D错误