脑脊液外观呈毛玻璃样混浊的疾病是（）
A.化脓性脑膜炎
B.结核性脑膜炎
C.病毒性脑膜炎
D.蛛网膜下腔出血
E.流行性乙型脑炎
参考答案：B
用所给单词的适当形式填空。
l. It's important for us _______ (exercise) very often.
2. I hope you're _______ (enjoy) my school.
3. I'm feeling much ______ (good) now.
4. ______ (eat) healthy food is good for us.
5. ______ (not eat) junk food.
硫在钢中的含量过高会使钢产生（）现象。
