The simplest animals are those whose bodie

根据句意和所给的首字母提示，补全句子中的单词。

1. If there were more trees on the earth, there would be l____ pollution.

2. I don't like eating lemon. It t____ too sour.

3. The injured people were taken to hospital i____ after the accident.

4. Look, the expression on his face s____ that something bad must have happened to him.

5. According to an ancient Chinese legend, the emperor Shen Nong d____ tea.

叩击跟腱引起相连的同块肌肉收缩，属于

A．肌紧张

B．腱反射

C．屈肌反射

D．姿势反射

E．多突触反射

（）拉伸试验的合格标准是焊接接头的抗拉强度不低于母材抗拉强度规定值的下限。

A、低温

B、高温

C、超高温

D、常温

反映体内最近期、近期、远期功能硒水平的指标分别为（）。

A.血小板、血浆、红细胞谷胱甘肽过氧化物酶活性

B.血小板硒、血浆硒、红细胞硒、发硒

C.血浆、血小板、红细胞谷胱甘肽过氧化物酶活性

D.血小板硒、红细胞硒、血浆硒、发硒

E.红细胞、血浆、血小板谷胱甘肽过氧化物酶活性

为核酸的一种，其化学结构名称为次黄嘌呤核酸的物质是（）

A.肌苷

B.肌苷酸

C.尿酸

D.肌酸

E.肌酐