淋巴结的结构特点包括()。
A.表面有被膜
B.实质分皮质和髓质两部分
C.皮质由浅层皮质、副皮质区及皮质淋巴窦构成
D.髓质由髓索和髓窦组成
E.以上均是
参考答案:E
三、开放作文(15分)
请根据下面提示,写一篇短文。词数不少于50。
In your English class,you are asked to describe the following picture and explain to your classmates how you understand it.