绘制圆的中心线时，（）应是长线段的交点。

传输设备故障定位的一般原则是什么？

成年男性的血红蛋白正常值范围为()。

A．110～150g/L

B．110～160g/L

C．120～160g/L

D．120～170g/L

E．170～200g/L

The advertisement appeared in my e-mail—“1-800-Flowers: Mother’s Day Madness —for just $39.99！” I almost clicked on it, forgetting that those services would not be needed this year. My mother, Margaret Feiddman, died at the age of 89, and so this is my first Mother’s Day without my mom.

In my childhood, my mom appeared to be a typical suburban housewife of her generation. She sewed many of my sisters’ clothes, including both of their wedding dresses and boy’s suits for me. And on the side, she won several national bridge tournaments(桥牌锦标赛).

My mom left many indelible marks on me. The first was to never lose heart and to be independent. My dad died suddenly when I was 19. My mom worked hard for a couple of years. But in1975, I won a scholarship to study in Britain and my mom surprised us all by announcing that she decided to go with me. When I met difficulties, she always said: “You’re a man, so never lose heart, never be knocked down, and try your best to pursue(追求) your dreams.”

My mom’s other big influence on me is a sense of optimism. She had taken her knocks. But every time life knocked her down, she got up and kept on marching forward, encouraged by the saying that pessimists(悲观者) are usually right, optimists are usually wrong, but most great changes are made by optimists.

How I wish to listen to my mother’s words, and give my best regards on this Mother’s Day, but I have no chance now! My best friends, treasure(珍惜)your mother’s love!

小题1:The author mentioned the advertisement to ___.

A．show he’s tired of the advertisements

B．explain he missed his mother very much

C．make you believe that he was very kind

D．urge the readers to buy the present for their mothers小题2:What experience of the author’s mother surprised the author?

A．That she volunteered to go to Britain with her son.

B．That she gained knowledge all by herself.

C．That she did all the housework by herself.

D．That she won several national bridge tournaments.小题3:What dose the underlined word “indelible” in the 3rd paragraph probably mean?

A．be out of control

B．be easy to remember

C．be destroyed easily

D．be impossible to forget小题4:We can know about the author’s mother that_____.

A．She encouraged the author to pursue his dreams

B．she felt very lonely in her late life

C．She never received a present from her children

D．she passed away before the author’s father小题5:Which can be the best title for the passage?

A．My Great Mother

B．Mother and I

C．Treasure Mother’s Love

D．Mother’s Day Madness

集团综合接入类用户端故障，如线路、设备故障等，申诉渠道为（）、（）。

喷射混凝土的配合比是（）。

A.1：2：1

B.1：2：2

C.1：2：3