和数轴上的所有点一一对应的数是（ ） A．实数 B．有理数 C．整数 D．无理数

阅读理解。

     The blue tits (山雀) have been inspecting the nest-box again this year. The male is the house-hunter but the female will make the final choice. He lands at the hole and turns his head to expose his white cheeks as a signal to attract the female from where she has been feeding. Among many birds that nest in holes, the

male has a light-coloured patch on its plumage (鸟羽) which acts as signal for drawing the female's

attention to a suitable nesting-place. Unlike the blue tit, the redstart (红尾鸲) may be only the male that

strikingly coloured and the female is not beautiful.     

     A few years ago I was lucky enough to spot a pair of redstarts in action in a Walsh wood. The male

was leading an interested female to holes that he had previously (先前) checked out. He sat at the

entrance of each hole and put his head on to show off his white forehead, or his head in to reveal (显露)

his tail.     

     If the female failed to react to his visual signals, the male sometimes sang for extra effect, while gliding towards her on spread wings and tail. Once the female accepts by following the male through the hole the

displays stop, you must be at the right place at the right time to watch them.  

1. How do the blue tits choose their nest?

A. They choose their nest together.      

B. The male chooses their nest.

C. The house-hunter chooses their nest.

D. The female chooses their nest.

2. The writer was lucky to see _____.

A. how the male made his tricks

B. how an interested female played with the male happily

C. what the male displayed and won the female

D. that the male tried his best but failed to attract the female

3. You can spot a pair of redstarts in a Walsh wood _____.

A. at any time  

B. regularly      

C. in April      

D. occasionally

4. The writer is probably _____.

A. a bird expert

B. a bird-hunter

C. a bird raiser  

D. a scientist

一般来说，对于含有环烷烃含量很高的原料，重整各反温度采用（）操作较合适。

A、等温式

B、递升式

C、递降式

D、拱桥式

底盘测功机的主要作用是（）。

A、吸收功率

B、道路阻力模拟

C、车轮驱动

D、倒拖

提出儿童友谊发展五阶段说的是（）。

A.科尔伯格

B.弗洛伊德

C.艾里克森

D.塞尔曼

E.皮亚杰

“口苦”是胆的什么病理改变的外在证候？（）

A.胆汁外溢

B.胆报上逆

C.胆汁排泄障碍

D.胆气不宁