题干

我国科学家屠呦呦因发现治疗疟疾的新药物青蒿素而获得2015年诺贝尔医学奖.青蒿素是﹣种无色针状晶体,易溶于有机溶剂,不溶于水,不易挥发,主要从黄花蒿中提取.近年来又发现靑蒿素具有较强的抗肿瘤作用,某科研小组按如下步骤进行了相关实验:

①从黄花蒿中提取青蒿素;②将等量癌细胞分别接种到4组培养瓶中,适宜条件下培养24h后除去上清液;③向4组培养瓶中分别加入等量含2、4、8、16μmol/L青蒿素的培养液,适宜条件下继续培养;④72h后统计并计算各组的细胞增殖抑制率.

回答下列问题:

上一题 下一题 0.0难度 选择题 更新时间:2017-05-09 04:02:12

答案(点此获取答案解析)

同类题1

根据短文内容,从短文后的选项中选出能填入横线上的最佳选项,选项中有两项为多余选项。

    As we know,there are differences between Westren culture and  Chinese  culture.____.Let's look at some words about animals and plants.Most expressions in Chinese about the dog,for example,"a homeless dog","a mad dog","A running  dog"and"A dog catching a mouse",have bad  meanings.____,In  English,people use the  dog to describe good actions.For example,"you are A lucky dog"means you are A lucky person.And‘every dog has its day"means each person has gool luck sometimes.To describe a person's serious illness,they say‘sick as a dog".The word"dog﹣tired"means very tired.____.But in Western culture,"cat"is often used ti describe a woman who is unkind.There are many other examples of how"cat"is used to describe a woman who is unkind.There are many other examples of how‘cat"is used differently as well.

    ____People think the rose stands for love,peace,courage and friendship.And the rose is the national flower of England,America and many other countries.

    ____We can learn about many differences in cultures by comparing how some words are used.

A.Howerver,Chinese love cats very much

B.The words about plants and animals are used in good or bad ways in different cultures

C.We can see differences when we pay attention to the way words are used

D.However,westerners love cats very much

E.We can see simliarities when we pay attention to the way words are used

F.The rose is regarded as a symbol of love in both China and some Western countries

G.But in Western countries,dogs are considered to be honest and good friends of humans.