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问题 单项选择题

二氧化碳全淹没灭火系统是由固定的二氧化碳贮存容器、容器阀、（）、操作控制系统及附属装置等组成。

A．集合管、软管卷轴

B．管道、喷嘴

C．集合管、喷嘴

D．软管卷轴、管道

答案

参考答案：B

填空题

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United Nations officials say (5) ________of that is needed during the next six months.The concern about offers of international aid is (6)________. For example, the earthquake in Bam, Iran, in (7)________of 2003 killed more than (8) ________people. Countries and groups offered hundreds of millions of dollars (9) ________. The United Nations says it has (10)________only about (11)________dollars in aid received so far. Governments and organizations that offered help (12) ________that, however.On (13)________Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14)________. The leaders discussed and (15)________the idea of (16)________owed by affected nations. But the leaders did not say they would do so. Some said that (17)________to survivors would be more helpful.Representatives of (18)________countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19)________ for the Indian Ocean and the (20)________.
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单项选择题

下列关于光合作用的叙述，正确的是：（）

A.光合作用只需要光，与酶无关

B.光合作用为植物提供所需的全部物质

C.光合作用是生物所需的有机物和能量的主要来源

D.光合作用的光反应只在白天进行，暗反应只在夜间进行
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