可表达CD40L的淋巴细胞是
A.静息T细胞
B.静息B细胞
C.活化B细胞
D.活化T细胞
E.活化NK细胞
参考答案:D
以下哪项不是牙髓的特点()
A.被坚硬的牙本质壁包围
B.基质富含纤维且具有黏性
C.有丰富的侧支循环
D.牙髓是一种疏松的结缔组织
E.牙髓对刺激只表现为痛觉
用所给单词的适当形式填空。
1. It's too late. Let's________ (take) a bus to school.
2. Who________ (want) to go there now?
3. They are________ (laugh) loudly.
4. He says nothing and goes ________ (quiet).
5. Oh, my dear! Please________ (do) drive so quickly.