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问题 选择题

Bad luck! Our water supply _______ while we were making our way in the desert.

A．used up

B．gave out

C．went off

D．turned over

答案

答案：B

选择题

下列所述事实与化学（或离子）方程式不相符的是

A．能说明氧化性H2O2＞Fe3＋：2Fe2＋＋H2O2＋2H＋＝2Fe3＋＋2H2O

B．能说明NH3结合H＋能力比H2O强：NH3＋H3O＋＝＋H2O

C．能说明盐酸是强酸：2HCl＋CaCO3＝CaCl2＋CO2↑＋H2O

D．能说明CH3COOH是弱电解质：CH3COO－＋H2OCH3COOH＋OH－
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单项选择题

Multipurpose Internet Mail Extension (MIME) is a (1) document messaging standard in the Internet enviroment, with MIME, users can send (2) Email messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (3) into messages. It defines the fonts, formats, and (4) features of a document so the document can be easily (5) on many different types of systems.

3（）

A．incorporated

B．filled

C．stored

D．filed
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