题目内容

纤维素细胞壁( )

A. 加苏丹Ⅲ试液显红色
B. 间苯三酚试液再加盐酸显红色
C. 加氯化锌碘试液显蓝色
D. 加硫酸无变化
E. 加碘试液显蓝色或紫色

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精密称定是指称取重量应准确至所取重量的( )

A. 十分之一
B. 百分之一
C. 千分之一
D. 万分之一
E. 十万分之一

Steven works in a farm tool factory. He and five of his friends are very interested (Example: (0) ) singing. So they have (41) a singing group which is called Happy Birds. They sing (42) songs both in Chinese and in foreign languages. They sing very (43) . The ot her workers and people (44) the villages around really like to h ear them (45) . Now New Year’s Day (46) here soon. The Happy Birds have been asked to (47) at different places. They’d (48) to go to all of them. (49) one friend has too much work and (50) may have to give up his holidays. The Happy Birds can’t sing without him.

A. many
B. much
C. lot

燃之熔融成红紫色液体，冒黄色烟有浓烈蒜臭气的是( )

A. 西红花
B. 苏木
C. 秦皮
D. 雄黄
E. 红花

Steven works in a farm tool factory. He and five of his friends are very interested (Example: (0) ) singing. So they have (41) a singing group which is called Happy Birds. They sing (42) songs both in Chinese and in foreign languages. They sing very (43) . The ot her workers and people (44) the villages around really like to h ear them (45) . Now New Year’s Day (46) here soon. The Happy Birds have been asked to (47) at different places. They’d (48) to go to all of them. (49) one friend has too much work and (50) may have to give up his holidays. The Happy Birds can’t sing without him.

A. sang
B. sing
C. to sing