关于自身抗体,以下哪一项描述是正确的()
A.自身免疫病患者才有
B.健康人血清中即可存在
C.转输同种动物可引起自身免疫病
D.为器官特异性
E.均为IgM型
参考答案:B
读短文,判断正(√)误(×)。
I'm Alice. This is our school. It is big. This is my classroom. It's big and clean. Look! That is my desk. It is yellow. My teacher is Miss Li. She is in the classroom. She is a good teacher. I like my teacher.
( ) 1. My name is Alice,
( ) 2. My school is small.
( ) 3. My classroom is dirty (脏的).
( ) 4. My desk is yellow.
( ) 5. Miss Li is not in the classroom.
2011年3月19日法英美展开对利比亚的军事行动,利比亚多处军事和民用目标
遭到导弹袭击,造成平民伤亡,建筑设施严重毁坏。这表明
A.世界形势和平与动荡并存
B.美国极力构筑单极世界
C.多极化格局的形成很漫长
D.霸权主义仍在影响和平