如图所示，一物体以速度v₀自倾角为θ的固定斜面顶端水平抛出后落在斜面上，物体与斜面接触时速度与水平方向的夹角为φ₁．若将物体的速度减小到 $\frac{v_0}{2}$ ，再次从顶端水平飞出，落到斜面上，物体与斜面接触时速度方向与水平方向的夹角为φ₂，（不计物体大小），则（  ）

当含有下列结构片断的蛋白质在胃中水解时，不可能产生的氨基酸是（　）

毕加索曾说：“我的没衣服画中都装有我的血，这就是我的画的含义”。下列属于他的代表作品是（   ）

根据句意及首字母提示补全对话

A: Hi, Lingling. Could you help me w____ my homework?

B: What is that?

A: Our teacher a____us to write a composition about a famous people. But I have no idea.

B: W____don’t you introduce Confucius?

A: That s____like a good idea. What do you k____about Confucius?

B: Well, Confucius was a great t____and a very wise man. He was a teacher, and he taught lots of students in different countries. And his t____were mainly written in Lunyu. His works are r____by millions of people, and we’re still i____by him nowadays.

A: What are his thoughts?

B: Do you know that parents and grandparents are highly r____ in China?

A: Yes, I do.

B: That’s one of his thoughts.