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【单选题】

下面有3篇短文,每篇短文后有5道题,每道题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题,从4个选项中选择1个最佳答案。
第一篇
Electronic Mail
During the past few years, scientists all over the world have suddenly found themselves productively engaged in task they once spent their lives avoiding - writing, any kind of writing, but particularly letter writing. Encouraged by electronic mail’s surprisingly high speed, convenience and economy, people who never before touched the stuff are regularly, skillfully, even cheerfully tapping out a great deal of correspondence.
Electronic networks, woven into the fabric of scientific communication these days, are the route to colleagues in distant countries, shared data, bulletin boards and electronic journals. Anyone with a personal computer, a modem and the software to link computers over telephone lines can sign on. An estimated five million scientists have done so with more joining every day, most of them communicating through a bundle of interconnected domestic and foreign routes known collectively as the Interact, or net.
E-mail is starting to edge out the fax, the telephone, overnight mail, and of course, land mail. It shrinks time and distance between scientific collaborators, in part because it is conveniently asynchronous (异步的). (Writer can type while their colleagues across time zones sleep; their message will be waiting. ) If it is not yet speeding discoveries, it is certainly accelerating communication.
Jeremy Bernstein, the physicist and science writer, once called E-mail the physicist’s umbilical cord (脐带). Later other people, too, have been discovering its connective virtues. Physicists are using it; college students are using it; everybody is using it; and as a sign that it has come of age, the New Yorker has celebrated its liberating presence with a cartoon—an appreciative dog seated at a keyboard, saying happily, "On the Internet, nobody knows you’re a dog. "
Electronic MailThe reasons given below about the popularity of E-mail can be found in the passage EXCEPT ______.

A.
direct and reliable
B.
time-saving in delivery
C.
money-saving
D.
available at any time
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【单选题】利率互换中固定利率一般选择()的利率。

A.
双方协商而定
B.
使互换初始价值为0
C.
选取的参照利率的即期
D.
使互换初始价值最大

【多选题】根据我国《合同法》的规定,在( )情形下,要约失效。

A.
拒绝邀约的通知到达要约人。
B.
要约人依法撤销要约。
C.
承诺期限届满,受要约人未作出承诺。
D.
受要约人对要约的内容作出实质性变更
E.
要约人依法撤回要约

【单选题】下列各选项正确的是( ).

A.
若收敛
B.
若都收敛
C.
若正项级数
D.
若级数收敛,且an≥bn(n=1,2,…),则级数也