题目

安琪在自家门口的大树上发现一个鸟窝，下列有关说法错误的是（） A . 鸟筑巢是先天性行为 B . 鸟类的双重呼吸（除具有肺外，并有从肺壁凸出而形成的薄膜气囊）是其持有的呼吸方式大大提高了气体交换的效率 C . 鸟类是恒温动物，现代鸟类是由古代的两栖类进化而来 D . 在食物链“草→虫→鸟”中，若草被污染，鸟内的有毒物质积累最多。 阅读下面短文，从短文中所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。 　　“Down-to-earth”means someone or something that is honest, practical and easy to deal with．It is 　　1　　 to find someone who is down-to-earth．A person who is down-to-earth is easy to talk to 　　2　　 accepts other people as equals．A down-to-earth person is just the 　　3　　 of someone who acts important and proud． 　　Down-to-earth persons may be 　　4　　 members of society, of course．But they do not let their importance“go to their 　　5　　”．They do not 　　6　　 themselves to be better persons than others of less importance, someone who is filled with his own importance and 　　7　　, often without cause, is said to have“his nose in the air”．There is no way a person with his nose in the 　　8　　 can be down-to-earth．Americans use another expression that means almost the same 　　9　　 “down-to-earth”．The expression is“both-feet-on-the-ground”．Someone with both-feet-on-the-ground is a person 　　10　　 a good understanding of reality．He has what is called“　　11　　 sense”．He may have 　　12　　, but he does not allow them to 　　13　　 his knowledge of what is real．The opposite kind of person is 　　14　　 who has his“head-in-the-clouds”．A man with his heads in the clouds is a dreamer whose mind is not in the 　　15　　 world． 　　Sometimes 　　16　　 a dreamer can be brought back to earth．　　17　　 words from a teacher can usually bring a day-dreaming student down-to-earth． 　　Usually, the person who is down-to-earth is very 　　18　　 to have both feet on-the-ground． 　　　　19　　 we have both our feet on-the-ground, when we are down-to-earth, we act 　　20　　 and openly toward others．Our lives are like the ground below us, solid and strong． (1) [　　] A． common B． sad C． pleasant D． surprising (2) [　　] A． but B． yet C． and D． while (3) [　　] A． kind B． like C． example D． opposite (4) [　　] A． important B． famous C． successful D． necessary (5) [　　] A． nose B． heads C． minds D． forehead (6) [　　] A． wish B． desire C． expect D． consider (7) [　　] A． proud B． pride C． famous D． fame (8) [　　] A． air B． sky C． tree D． cloud (9) [　　] A． like B． with C． as D． for (10) [　　] A． has B． who C． is D． with (11) [　　] A． usual B． ordinary C． common D． daily (12) [　　] A． dreams B． fortunes C． advantages D． luck (13) [　　] A． prevent B． protect C． block D． gain (14) [　　] A． one B． those C． that D． the one (15) [　　] A． reality B． real C． dreamful D． true (16) [　　] A． so B． such C． each D． that (17) [　　] A． Sharp B． No C． All D． Bad (18) [　　] A． able B． probable C． likely D． possible (19) [　　] A． When B． While C． As D． Since (20) [　　] A． kindly B． directly C． honestly D． friendly