慢粒常见的染色体突变是（） A.Ph’染色体，［t（9；22）（q24；q11）］

阅读理解。

     Swimming is very popular in the world. People like swimming in summer, even in the other three

seasons. Because water makes. people feel cool and swimming makes people keep fit.

     If you swim in a wrong place, it may not be safe (安全的). A lot of people died when they were

enjoying  themselves in the water, and most of them were students. Last summer, a few students from

one school went to swim in the river near their school. As a result, three of them never came out of the

river.

     Now people are not careful enough (足够的) in swimming. They often think they can swim so well

that nothing will happen to them in water.

     Summer is here again. If you go swimming in summer,don't forget that a lot of good swimmers have

died in water. They died not because they couldn't, swim, but because of their carelessness (粗心大意).

Don't get into water when you are alone .If there is a "No Swimming" sign, don't get into water. If you

remember these, swimming will be safe and enjoyable (有趣的).

1. People like to swim in summer because ______.    

A. they feel cool in the water     

B. they are free     

C. it makes them strong

D. they are good swimmers

2. Some  swimmers died in water because ______.     

A. they think they  can swim well     

B. they are not strong enough     

C. they are students

D. they are not careful

3. The writer wants to tell us ______.     

A. swimming is good in summer     

B. that we should go swimming in summer     

C. that we must be careful in swimming

D. students should not swimming the river

4. Which of  the. statements  (叙述) is TRUE?     

A. Swimming in a wrong place may be not safe.     

B. No people died when they were enjoying swimming in the water.

C. Nothing will happen to good swimmers in winter.

D. If someone goes swimming in summer, he will die.

下列说法中，你认为不科学的是（　　）

A．食用加碘食盐可预防甲状腺肿大

B．绿色食品是指不含任何化学物质的食品

C．使用含氟牙膏可预防龋齿

D．光导纤维是以二氧化硅为主要原料制成的通讯材料

女，14岁，体格及智力发育与同龄人相似，已出现第二性征3年，一直无月经来潮。近1年常感下腹胀痛，每1~2月发作一次，每次持续3~4天，可自然缓解，近来偶于腹痛时伴有腰骶部胀痛及肛门坠胀，亦可自然缓解。2月前无意阎发现下腹部有一包块。查体：身高160cm，体重50kg， * * 发育良好，女性体态，其他系统查体未发现异常。

该患者诊断首先可考虑（）

A.子宫内膜异位症

B.盆腔炎

C.先天性处女膜闭锁

D.卵巢肿瘤

E.先天性无 * *

F.子宫肌瘤

在《全国旅游标准化试点地区评估表》中，针对旅游住宿方面的考察主要依据哪几项标准？

关于人类“21三体综合征”、“镰刀型细胞贫血症”和“唇裂”的叙述，正确的是（）

A.都是由突变基因引发的疾病

B.患者父母不一定患有该种遗传病

C.可通过观察血细胞的形态区分三种疾病

D.都可通过光学显微镜观察染色体形态和数目检测是否患病