自熔性烧结矿是指：碱度（R）为（）倍的烧结矿。

丹顶鹤：白头翁（）

A．花面狐：长颈鹿

B．北极熊：唐老鸭

C．金钱豹：草珊瑚

D．响尾蛇：座山雕

阅读理解。

     When the two tiny ducklings were caught by the sharp jaws of a larger German shepherd, they must have

thought their time on earth was up.

     But as luck would have it for the frightened wild ducklings that had lost their mother, the dog that helped

them out of the bushes had only their best interests at heart. Duke, a one-year-old German shepherd, found the

two ducklings hidden in long grass next to his owner's workplace on the edge of the Thronybankw.w.^

Industrial Estate in Dalkeith.

     And despite the natural instincts of a hunter, the dog gently took them in its mouth and carried them back

to his blanket, putting them down where it was warm and even washing them clean with his tongue. The

ducklings will be looked after by staff at the center until they are old enough to be released into the wild.

      "This dog is a modern day Rin Tin Tin, ( the world's most famous German shepherd dog) and to pick

them up in his mouth without harming them is quite something."To them try and wash them is just amazing

behavior." said one of the staff.

1. The underlined part in the first paragraph means ________.

A. they used up their time completely.

B. they will become the food of the dog.

C. they will be saved by the dog.

D. they have finished their daily job.

2. Duke is the ________ of the German shepherd.

A. name

B. owner

C. friend

D. trainer

3. From the sentence "And despite the natural instincts of a hunter,…" in fourth paragraph

    we learned the fact that ________.

A. Dogs are friendly to their preys

B. Dogs change their appetite

C. Dogs are born hunter

D. Dogs become vegetarian

4. According to the last two paragraphs we know that it is ________ for a hunter like dog to save

      and even lick ducklings clean.

A. common

B. impossible

C. interesting

D. amazing

下列哪类行业使用了增重原料（）

A、棉纺厂

B、金属构件厂

C、啤酒厂

D、粗钢冶炼厂

男性患病机会多于女性的隐性遗传病，致病基因最可能在（）

A.常染色体上

B.Y染色体上

C.X染色体上

D.难以确定

每块SPB单板最大支持（）条64KN7信令，或者（）条2M信令。

A.32，2

B.16，2

C.16，4

D.32，4