有关黄色圆粒豌豆(YyRr)自交的表述，正确的是（    ）

下图显示制作洋葱鳞片叶内表皮细胞临时装片的几个步骤。请根据制作临时装片的知识回答问题

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（/\），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：1）每处错误及其修改仅限一词；
2）只允许修改10处，多者（从第11处起）不记分。
    My experience at the begin of my high school life has taught me a good lesson. During that period, it never occurred to me that I was going to be or what kind of life I'd like to live. I always waste my time chatting online and play computer games. It was my poor grades in the mid-term exams and my head teacher's inspiration that made me realized the importance of set a goal. From then on, I made my mind to get admitted into a famous university and devote me to some research work. Guided by my dream, I found myself making a great progress.
    As a famous man once said, “ Living without an aim is like sailing without compass”. Only if we have certain goals in mind and stick on them can we make a difference and achieve success.

（2016•鄂州）歌曲《大中国》歌词：“家里盘着两条龙，是长江与黄河啊…”根据你所学的知识，指出长江与黄河注入的海洋分别是（ ）

A．黄海、渤海 B．东海、渤海C．东海、黄海 D．渤海、黄海

如图，直线a，b都与直线c相交，给出的下列条件：

①∠1=∠7；②∠3=∠5；③∠1＋∠8=180°；④∠3=∠6．

其中能判断a∥b的是（　　）