右图为一食物网,若蛇被全部捉光,则此食物网中①的数量将大量减少,②的数量会有增加的趋势,其中的①、②依次为( )
A:花生、山猫
B:兔、鹰
C:地鼠、草
D:兔、山猫
阅读短文,并根据短文内容判断正(T),误(F)There are four people in my family. My father is a policeman. His work is kind of dangerous.He's very busy. He often has meals outside. Sometimes we can't see him all day. But I love him very much. My mother is a bank clerk, but she wants to be a reporter .She says her job is boring and being a report is interesting, because she can meet many interesting people .My brother is a waiter .He likes his work, because he thinks he can meet many new friends when he works.I'm a middle school student .I study hard because I want to be teacher. I think it's not difficult for me.
默写填空。
不似春光。胜似春光,____。(***《采桑子重阳》)
阅读下面甲、乙两篇文言文,完成后面的题。(甲)郑人有欲买履者,先自度其足,而置之其坐。至之市,而忘操之,已得履,乃曰:“吾忘持度。”反归取之。及反,市罢,遂不得履。人曰:“何不试之以足?”曰:“宁信度,无自信也。”(乙)范氏之亡也①,百姓有得钟者②。欲负而走③,则钟大不可负;以椎毁之④,钟况然有音⑤。恐人闻之而夺已也,遽掩其耳。注释:①范氏之亡也——范氏是春秋末期晋国的贵族,被其他四家贵族联合打败后,逃在齐国。亡,逃亡。 ②钟——古代的打击乐器。 ③负——用背驮东西。 ④椎(chuí)——槌子或棒子。 ⑤况(huàng)然——形容钟声。
甲:将一个正在响的响铃放在玻璃钟罩内,然后将钟罩内的空气抽去一些,铃声明显减小;
乙:使正在发声的音叉接触水面,水面激起水花;
丙:在鼓面放一些小纸屑,击鼓时纸屑随着鼓一起跳动;
丁:吹笛子时,手指按住不同的孔便会发出不同的声音;
上述现象中能够说明声音的产生条件的实验现象是____和____;其中甲同学的现象说明了声音____;丁同学的现象说明了声音有不同的____.