题干

下列关于植物组织培养的叙述中,错误的是(  )

A:以一株植物的叶片或花药为外植体培育的植株基因型相同

B:培养过程中应给予适当光照以促进愈伤组织的光合作用

C:适当提高培养基中细胞分裂素的比例有利于愈伤组织分化成芽

D:常用茎尖进行组织培养获得脱毒苗是因为茎尖不含有毒物质

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答案(点此获取答案解析)

A,B,D

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    How to Become an Activist (活动家)

    Activists are people who see the need for change and devote their time to doing something about it.____If you are interested in it you can do so.

    ____This could be anything from a student club to a national organization (like the American Civil Liberties Union or the National Organizers Alliance). Most activist organizations offer different levels of involvement, so you can do whatever you feel most comfortable with, whether that means attending meetings and demonstrations or just donating a little money when you can.

    Volunteer your time. One of the best ways to make a difference is to volunteer your time. Reach out to organizations in your community that do work for your cause, and ask how you can help.

    Donate money or supplies.____If you can't afford to donate money to an organization that supports your cause, you may be able to donate other things they need, like clothing or canned food.

    Reach out to family and friends. Tell your family and friends about your cause, and invite them to get involved. If they are interested, share literature about your cause or just talk to them about what you have learned.____

    Promote your cause on social media. You can use social media to help keep your friends and followers informed about the causes you support.____Also, you can invite your friends to attend events or donate to fundraisers for your cause.

A. Take classes on issues related to your cause.

B. Join an organization that supports your cause.

C. They are driven by passion and a vision for a better future.

D. If you do volunteer work, invite them to volunteer with you.

E. Most activists or charitable organizations need resources to do their work.

F. Post useful articles and write about what you are doing to stay involved.

G. If you can't reach out to them in person, then try connecting to people online.