参加导游资格考试合格的，由组织考试的旅游行政管理部门在考试结束之日起（）个工作日内颁

期货公司变更注册资本，国务院期货监督管理机构应当自受理申请之日起（）内作出批准或者不批准的决定。

A.10日

B.15日

C.20日

D.30日

下列各句中，加点的词语使用恰当的一项是 （   ）

A．信贷活动中，银行轻易放贷，必然造成呆帐、坏帐的增加，致使尾大不掉，必然影响资金的回笼和流通。

B．在汉代文学中,借屈原之名表达自己情感的作家为数不少,提及屈原这位令人充满同情的诗人,往往使作家在身处坎坷之时顿将失意、挫折、忧愁幽思都涣然冰释了。

C．奥运会赛场陆续落成，中外记者参观后，他们对国家体育场——“鸟巢”这鬼斧神工的建筑赞叹不已。

D．作为合作四十年的手足情深的搭档，面对侯耀文的突然离世，石富宽先生沉浸在失之交臂的痛苦中。

论者评宋初两大山水画家谓：“（）之画，近视如千里之远，范宽之笔，远望不离坐外。”

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)________.

简述Fe₃O₄鉴定的主要特征？