以下组合中，均为必需氨基酸的是（）。A．苏氨酸、色氨酸、赖氨酸、胱氨酸 B．蛋氨酸、

下列属于体温恒定的动物是

①鲫鱼，②家鸽，③青蛙，④熊猫，⑤蚯蚓，⑥麻雀，⑦蝗虫，⑧鲸

A．①③⑤⑦

B．②④⑥⑧

C．①②③④

D．⑤⑥⑦⑧

阅读下面的短文，并借助上下文和插图补充所缺信息。每个空只能填写一个形式正确、意

义相符的单词。

Marsha is the English teacher of Class 1. She is kind and likes to tell stories in her class, so all the 小题1: ＿＿＿＿like to be with her. Last week, two students didn't finish their homework. That 小题2:_______ Marsha a little angry. She 小题3:_______the two students to stay in the classroom after school. When school was over, all the students went 小题4:________except (除…以外) the two students. Marsha asked them to 小题5:______ the homework first. The two students 小题6:________ as she asked. After they finished their homework, Marsha told them a 小题7:_______about her classmate, Tony. Tony was lazy when he was a student. He didn't do his小题8:_______ every day. When he graduated (毕业) from high school, he wanted to find a job. But he couldn' t find a good 小题9:________. At that moment, he regretted (后悔) what he had done. After 小题10:_________ to the story, the two students felt sorry. They told Marsha they would finish homework on time and they would study hard.

α^-醋酸荼酚酯酶染色阴性的细胞是

A．单核细胞

B．早幼粒细胞

C．中幼粒细胞

D．淋巴细胞

E．浆细胞

对于氧化剂的保管和养护应该做到（）。

A.有机氧化剂不能与无机氧化剂混存

B.氯酸盐、高锰酸盐等不能混存

C.应与热源、火种、生活区等相隔离

D.应与爆炸物、易然物等相隔离

E.过氧化钠等过氧化物应设专库存储

违约责任，是指当事人任何一方不履行合同义务或者履行合同义务不符合约定而应当承担的法律责任。下列属于承担违约责任的形式的有（）

A.继续履行

B.采取补救措施

C.赔偿损失

D.支付违约金

E.返还财产