(2)某同学用x培养液培养铜绿微囊藻时.加人粉绿狐尾藻(一种高等水生植物).结果铜绿微囊藻生长受到明显抑制.重要的原因是这两种生物在利用___等资源时存在显著的竞争关系。 (3)也有人提出假设:粉绿狐尾藻能产生化学物质抑制铜绿微囊藻的生长。请利用下列实验材料用具.完成实验设计.探究该假设是否成立。 材料...
If you can’t get to somewhere safe, stay out in the open. You may feel safe under a tree, but that is not a good place to be. Lighting is pulling toward tall poles and trees. Stay down in the open space and cover your ears to protect them. Loud thunder can damage your hearing...
The third one was for me. The children welcomed me warmly on my first day. They asked me a lot of questions, and I told them stories about myself and my life in Shanghai. The next day, I gave them a test to find out their level. Though the test was very easy, over half of ...
阅读下面短文.掌握其大意.然后从36-55各题所给的四个选项A.B.C和D中.选出最佳选项.并在答题卡上将该项涂黑.Years ago, I worked at the Ringling Brothers Barnum & Bailey Circus. One day, as I was passing the elephants, I suddenly stopped, by the fact that these
So here we are. I’m still good with the kindness idea, and I know the amount of time I’ve spent angry in the last few days means I haven’t succumbed to any of this being ordinary. I keep hearing myself say Election Day. ...
I started doing this because I was afraid I would lose the ability to walk. Now I see I do it because once I get downstairs I don’t know what to do with myself. Quells my anxiety. Then I take off my robe and hang it on the hook in the bathroom, and walk over to the note...
ABSOLUTELY. But one is not indicative of the other and I’m so tired of hearing it framed that way. Let’s say it again, for those in the back who maybe didn’t hear it last time: YOU CAN’T TELL IF SOMEONE IS A SEXUAL SUBMISSIVE WITHOUT THEM TELLING YOU OR SHOWING AN INTEREST ...
Hearing this, Beethoven 4 at the door, and it opened. In the candle light, he saw a young girl sitting at an old 5 . A young man was making shoes by a table near her. “To his 6 , Beethoven found the girl blind (瞎的). “Excuse me. Then you play by ear? But 7 did you ...
Yep…that’s one I think about more than I probably should. The National Library of Medicine reports that studies show female bipolar ‘patients’ have about a 10.6-8.3 years lesser life-span (while men lose 12.0-8.7 years) than the general population. This is even a bit higher than the...
of earth quakes.Earthquakes happen very 1 and violently(强烈地).During an earthquake,there is often a great 2 first.Then the earth 3 terribly,many houses 4 ,railway tracks break and trains run 5 lines,a great many factories are 6 ,thousands of deaths are caused,and many more lose homes...