能引起瑞夷综合征的药物是A．吡罗昔康 B．阿司匹林 C．双氯芬酸 D．对乙酰氨基酚

在研究平面镜成像特点的实验装置中．①此实验中用玻璃板代替平面镜，主要是利用玻璃板透明的特点，便于通过玻璃板找到像．如果有4mm厚和2mm厚的两块玻璃板，为提高实验效果，应选择______mm厚的玻璃板做实验．

②某同学点燃蜡烛后把它放在玻璃板前的某一位置处，

再把一支没有点燃的蜡烛移到跟前面那支蜡烛的像完全重合．在纸上记下______，用直线把这两个位置连起来，用刻度尺测量它们分别到平面镜的距离．根据这组数据，他得出实验规律：“平面镜成像时物距总是与像距相等”．你认为这种方法是否合理？______理由是______

③在探究平面镜成像的特点时，除了测量物距和像距之外，还必须比较______的大小．

④如果玻璃板没有放正，将对实验产生什么影响？______．

肩关节前脱位占肩关节脱位的（）

A.10%

B.40%

C.50%

D.80%

E.95%

用天文望远镜长期观测，人们在宇宙中发现了许多双星系统，通过对它们的研究，使我们对宇宙中物质存在的形式和分布有了较深刻的认识，双星系统是由两个星体构成，其中每个星体的线度都小于两星体间的距离，一般双星系统距离其它星体很远，可以当做孤立系统处理，现根据对某一双星系统的光度学测量确定，该双星系统中每个星体的质量都是M，两者相距L，它们正围绕两者连线的中点做圆周运动。

（1）计算该双星系统的运动周期T_计算。

（2）若实验上观测到的运动周期为T_观测，且T_观测：T_计算=1： (N>1)，为了解释T_观测与T_计算的不同，目前有一种流行的理论认为，在宇宙中可能存在一种望远镜观测不到的暗物质，作为一种简化模型，我们假定在这两个星体边线为直径的球体内均匀分布着暗物质，而不考虑其它暗物质的影响，试根据这一模型和上述观测结果确定该星系间这种暗物质的密度。

阅读理解。

Sunny

     Nowadays they are giving homework even during the holidays and I hate that very much. But I think there

is a reason for it. Homework is given so that we can remember whatever we have learnt. Regular drilling and

repetition make perfect. But teachers have started to give too much homework. Anything in excess (过度) is

bad. So homework should be given with the idea of giving students a practice and not to overwork them.

Jane

     What's the use of just homework without allowing children to get an insight (洞察) into the subject? It just

makes them bookworms but nothing else. Homework such as writing some things 5 times at home will just

make them memorize things but not put them into use. I regret to say that teachers find it easy to bundle (归拢)

the children with homework rather than making them get interested to understand what they learn. The same

trend continues even in college. I find that most of the so-called high scorers are unable to answer simple things

in an interview.

Sally

     It is OK to give homework. But it should be given less. We are spending most of our time in school and at

least we must be free in our home. If you give homework, we will be very tired and we wouldn't be able to

pay attention to extra-curricular (课外的) activities, which in turn may affect our physical and mental health.

So please give less homework to us.

Johnson 

    It is part of our work to give students homework. There will be some punishments if we won't do our

work. So I have to do that though I know such a teacher is not liked by students.

1. Who thinks that too much homework may do harm to students' physical and mental health? [ ]

A. Sunny

B. Jane

C. Sally

D. Johnson

2. Who thinks homework should helps students learn something practical? [ ]

A. Sunny

B. Jane

C. Sally

D. Johnson

3. According to the last paragraph, why do teachers give students homework? [ ]

A. Because they care more about students'mental health.

B. Because they find it easy to control students in this way.

C. Because they will be punished if they don't give homework.

D. Because they want students to get interested in their studies.

4. What problem do the speakers talk about? [ ]

A. Whether students should be punished without doing homework.

B. What kind of homework should be given to students.

C. What role homework plays in helping students to learn.

D. Whether teachers should give homework to students.

(75～76题共用题干)
11个月婴儿，广东人，母有流产史，近5个月面色苍白，在“感冒”时加重，伴小便呈茶色，无发热，皮肤、黏膜无出血，曾在外院输血2次。查体：明显贫血貌，双巩膜轻度黄染，双肺(-)，心尖部闻及Ⅱ/6级收缩期吹风样杂音，肝右肋下3cm，质中，脾左肋下5cm，硬。

为明确诊断，应做何检查( )

A．Hb分析

B．G-6-PD活性测定

C．乙肝两对半

D．骨髓细胞学检查

E．血清铁蛋白测定