战国时期之所以形成“百家争鸣”的局面，是因为
①社会正处于巨变时期  ②各国竞争与政治变革的需要
③阶级关系出现新的变化  ④儒家思想尚未取得正统地位

在撑杆跳高场地落地点都铺有厚厚的垫子，这样做的目的是减少运动员受伤，理由是（   ）

人在恐惧、紧张时，在内脏神经的支配下，肾上腺髓质释放的肾上腺素增多，该激素可用于心脏，使心率加快。下列叙述错误的是

A

    Today is Sunday, April 15th, everyone in Sheep Village（羊村）is very busy. What does he/she do?

    I'm Nuan Yangyang. I write a letter to my friend at one o'clock in the afternoon. Then I do my homework.

    I'm Fei Yangyang. I want to be strong（强壮的），so I go to the sports club to play sports in the morning. I go home at three ten in the afternoon.

    I'm Lan Yangyang. I like eating. I have breakfast at home. I have lunch in a restaurant. But the food isn't good, I don't like it.

    I'm Mei Yangyang. I go to a clothes store at nine in the morning. The clothes there are on sale, so I buy a nice skirt.

    I'm Xi Yangyang. I take the bus to the English club at ten sixteen in the morning. There I help two kids learn to speak English.

如图为反射弧模式图，李明不小心被针扎到，迅速缩手，对该反射的叙述正确的是（   ）