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问题 单项选择题

瑞氏染色下，红细胞中的嗜碱性点彩颗粒为（）

A.胞质内出现大小不一、数量不等的紫色颗粒

B.胞质内出现大小不一、数量不等的红色颗粒

C.胞质内出现大小不一、数量不等的蓝黑色点状物

D.胞质内出现大小和数量相等的蓝黑色颗粒

E.胞质内出现大小和数量相等的紫色颗粒

答案

参考答案：C

解析：瑞氏染色后，胞质内出现形态不一的蓝色颗粒（变性RNA），未属于未成熟红细胞，颗粒大小不一，多少不等。

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To Give up or Not to Give up as Class Monitor?

Dear Brad, 

In about 3 months, I will take a very important test. If I pass the test with good grades, I can get to the 10th grade and choose a good school to study in. Now I am trying my best to achieve this. At the same time, I’m the monitor in my class, which means I should do lots of things for my class. ① I am so busy with my school-work and duties as monitor that I don’t have enough time to keep a balance between them . Gradually I become lazy. ②The other day, my head teacher told me that she was disappointed in my poor performance as class monitor . Her words really discouraged me. 

What should I do now, to give up or not to give up as class monitor? I must do my best in school because how well I do will influence where I go after this school year is over and it can affect the rest of my life. Being class monitor is also a valuable learning experience because my teacher trusts me to be a good leader. ③ I don’t want to go to my parents for suggestions, for they will get worried about me . Can you tell me how to choose?

Yours, 

Gates

小题1:根据①处内容，完成下面的句子。（每空一词）

I am    busy with my school-work and duties as monitor      have enough time to keep a balance between them. 

小题2:根据②处内容，完成下面的句子。（每空一词）

The other day, my head teacher said to me, “             disappointed in your poor performance as class monitor.”

小题3:将③处翻译成汉语。
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问答题

白炽灯通常用钨丝作为灯丝，这主要是因为钨的______

A．熔点较高

B．比热较大

C．导电性好

D．容易氧化．
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