研究信息工作的理论、技术和方法综合性横断科学是（）。

在稳定的DNA双螺旋中，哪两种力在维系分子立体结构方面起主要作用

张红在公司已经工作了3年，今年怀孕休了产假，可是等到生完孩子回来，发现自己的职位已有其他人在做了，才知道公司前两个月由于业务繁忙，新招了一名员工，而她自己已被公司辞退。公司的这种做法侵犯了张红的（）。

A.政治权利

B.社会保障权利

C.劳动权利

D.人身权利

To be an excellent runner, you must be prepared to _______ much hard work.

A．go through

B．stand for

C．sort out

D．rely on

Although it is assumed that peacocks’ magnificent tails function essentially to attract peahens, no one knows why it should be magnificent tails that give a competitive advantage in securing mates. One explanation is that peahens are more likely to mate with peacocks with magnificent tails than with peacocks that lack magnificent tails.
Which of the following is an error of reasoning exemplified by the explanation

A．Attributing to animals qualities that are characteristically human.

B．Extending a conclusion that is true of only one species of a genus to all species of the genus.

C．Offering as an explanation a hypothesis that in principle can be neither verified nor proved false.

D．Offering the phenomenon that is to be explained as the explanation of that phenomenon.

E．(E) Assuming without warrant that peacocks with magnificent tails are likely to have other features ply attractive to peahens.

一条客船往返于甲、乙两个沿海城市之间，由甲市到乙市是顺水航行，由乙市到甲市是逆水航行。已知船在静水中的速度是每小时25海里。由甲市到乙市用了8小时，由乙市到甲市所用的时间是由甲市到乙市所用时间的1.5倍，则甲乙两个城市相距多少海里？

A.240 

B.260 

C.270 

D.280