基层安全保卫工作涉及的面比较广，任务重，头绪多，政策性强，要求高。
参考答案：对
阅读理解，回答问题。
Jim is a boy. He is from Canada. He is nine years old. He is a primary school student(小学生).
He can speak Chinese and English. He likes to play football. He is a good student. He is a Young Pioneer
(少先队员), too. Jim has a sister. Her name is Jenny. She is nine, too. She likes English. And she likes
to play baseball.
1. Who is the boy?
He _____ _____.
2. Is Jim a good student?
_____, _____.
3. Is Jenny a Young Pioneer?
4. Is Jenny Jim's friend?
5. Are they at the same age?
可以引起机体的髓外造血发生的疾病是 （）
A.脓毒症
B.骨髓纤维化
C.缺铁性贫血
D.骨髓增生异常综合征
E.自身免疫性溶血性贫血
