FrontPage2003中的框架是网页布局设计的重要手段，框架将浏览器窗口划分为多

x²-xy+______=（______）²．

将直接引语变为间接引语 (每空一词)。

1. "Where have you been these days?" he asked. 

    He asked me ____ ____ ____ been ____ days.

2. "I've found my wallet." he said to me.

    He ____ me that he____ ____ ____ wallet.

3. "I took it home with me." she said.

    She said that ____ ____ ____ it home with her.

4. The teacher said, "The sun rises in the east and goes down in the west."

    The teacher said that the sun ____ in the east and ____ down in the west.

5. "Do you know where she lives?" he asked.

    He asked ____ ____ knew where she ____.

6. "You must come here before five." he said.

    He said that I ____ to go ____ before five.

7. "I bought the house 10 years ago." he said.

    He said that he ____ bought the house 10 years ____.

8. "Did you see her last week?" he said.

    He ____ ____ I had seen her the week ____.

9. He said, "You can sit here, Jim."

    He ____ Jim that he ____ sit there.

10. He asked, "How did you find it, mother?"

    He asked her mother ____ ____ ____ found it.

高强度螺栓连接副在终拧以后，螺栓丝扣外露应为( )扣，其中允许有10%的螺栓丝扣外露1扣或4扣。

A．1～2
B．2～3
C．3～4
D．4～5

Spiders of many species change color to match the pigmentation of the flowers they sit on. The insects preyed on by those spiders, unlike human beings, possess color discrimination so acute that they can readily see the spiders despite the seeming camouflage. Clearly, then, it must be in evading their own predators that the spiders’ color changes are useful to them.
Which of the following, if tree, most strengthens the argument

A．Among the animals that feed on color-changing spiders are a few species of bat, which find their prey through sound echoes.

B．Certain animals that feed on color-changing spiders do so only sparingly in order to keep from ingesting harmful amounts of spider venom.

C．Color-changing spiders possess color discrimination that is more acute than that of spiders that lack the ability to change color.

D．Color-changing spiders spin webs that are readily seen by the predators of those spiders.

E．(E) The color discrimination of certain birds that feed on color-changing spiders is no more acute than that of human beings.

由于螺杆式压缩机利用变转速调节排气量受运行效率制约，故通常调速范围是额定转速的（）。

A.40%~60%

B.40%~80%

C.40%~100%

D.60%~100%