神经内分泌细胞指的是（）
A.神经垂体
B.腺垂体
C.下丘脑
D.垂体门脉系统
E.胰岛的C细胞
参考答案：C
根据句意和首字母提示完成单词。
1.I think Ding Zhaozhong is an o _______ scientist.
2.My aunt didn't go to the park. My cousin didn't go there,e _______. .
3. Bettina failed her test,so she was terribly u_______.
4. All students go to visit the Great Wall e_______Sam.
5.I have enough money to buy the computer,because it's i_______.
商场里有一种以木糖醇[C5H12O5]为甜味剂的“口香糖”，对初期蛀牙的修复有所帮助．请回答：
（1）木糖醇的相对分子质量______；
（2）木糖醇中碳、氢、氧元素的质量比______．
