用适当的词补全对话。

A: Do you know we have a new teacher and two new students this semester?

B: Really? What ____ the new teacher look ____?

A: He is an old man. He ____ no hair.

B: Is he ____?

A: Yes. And he ____ glasses.

B: ____ he have a mustache?

A: No, he ____ a beard. He is not good-looking. But he is very kind.

B: What ____ your new classmates? What ____ they ____ like?

A: They are twins. They look the ____. They ____ of medium height. They're not heavy ____ thin. They ____ curly hair.

B: What's the ____ ____ their hair?

A: Well, they ____ blonde hair. They are good-looking.

伊斯兰教、基督教、犹太教都奉为圣城的是：（ 　）

用右图装置可以探究二氧化碳的制取和性质，下列关于该实验的叙述正确的是（   ）

鱼、蝾螈、龟、鸡、猪、牛、兔7种脊椎动物和人的早期胚胎都有鳃裂和尾，这说明( )。

如图，在▱ABCD中，AM，CN分别是∠BAD和∠BCD的平分线，添加一个条件，仍无法判断四边形AMCN为菱形的是（　　）