用所给单词的适当形式填空。

1. The children were ________ because they didn't get Christmas presents. (happy)

2. How can you make yourself ________ if you cannot express yourself clearly? (understand)

3. December is the _______ month of the year. (twelve) 

4. The doctor's ________ made all of them sad. (dead)

5. I think this dictionary is ________ for your study. (help)

关于囊尾蚴病的临床表现，下列错误的是（）

A.癫痫是脑实质型脑囊尾蚴病最常见的症状

B.脑室型脑囊尾蚴病有时可表现为活瓣综合征

C.约2／3的患者有皮下囊尾蚴结节

D.眼囊尾蚴病多为双眼感染，最常寄生的部位在玻璃体和视网膜下

E.心肌也可有囊尾蚴寄生