用基因型为AaBb的普通水稻的花粉进行离体培养,得到的植株幼苗再用秋水仙素处理,

题型:选择题

问题:

用基因型为AaBb的普通水稻的花粉进行离体培养,得到的植株幼苗再用秋水仙素处理,最后得到的植株中纯合子所占的比例为[ ]

A.1/2

B.0

C.1/4

D.1

考点:植物的组织培养技术
题型:选择题

You are going to high school , aren’t you ? Maybe you don’t know what to do . Here is a list of the top six things to do when you are in high school . These things will give you ideas of what  your high school life could be like . Here you go !

①Find your passion (激情)and what kind of person you are : Whether it’s dance ,basketball ,or drawing ,the important thing is that you have found something you are interested in .

② Talk to people you wouldn’t usually talk to : Meet new people ,find new friends and even talk to the people you don’t like. It will show what a great person you are . You never know what will happen after high school.

③Take part in at least one contest: This will give you tears of laughter, happiness and memories .

④Get a job : This will help you see what it’s like to have responsibility(责任 ) . It can also help you make a little money to spend on yourself .

⑤Take a trip with your friends :It doesn’t matter where you go or what you do , the memories will happen on the way and go on till the final place .

⑥Do your best at school : Don’t ever get lazy . Working hard now will help you in the future.

小题1:The writer mainly tells you six things you should do         .

A.in your high school years

B.at the beginning of your high school years

C.before your high school begins

D.after you finish your high school小题2:Which of the following you’d better not do according to the passage?

A.find your interest.

B.get a job

C.take a trip with your friends

D.get lazy小题3:What’s the main idea of the passage ?

A.Have a happy school life.

B.How to get along with your school mates.

C.Ideas of successful high school life .

D.Make your school life easy .

题型:选择题

照明电器通常用()作额定值。

题型:选择题

囊痈肝经湿热可用:()

A.阳和汤

B.泻热汤

C.橘核丸

D.萆薢分清饮

E.萆薢渗湿汤

题型:选择题

男孩6岁,反复腹痛3个月,以脐周痛为主,疼痛多在十几分钟内自然缓解。查体:全身皮肤无黄染及出血点,腹平,全腹软,无压痛,未触及包块,直肠指检(-)。血WBC8×10/L,P46%。腹部B超未发现异常征象。下列疾病中,哪一种可能性最大

A.慢性阑尾炎

B.胆道感染

C.肠痉挛症

D.阶段性肠炎

E.腹型过敏性紫癜

题型:选择题

齿轮传动的缺点包括()

A.重量大

B.噪音大

C.传动距离较小

D.需要经常润滑

更多题库