A:甲图细胞属于原核细胞,判断的理由是无核膜
B:甲、乙两图的细胞共有的细胞器是核糖体
C:甲、乙两图的细胞均有具选择透性的细胞膜
D:甲、乙图中均有细胞壁,且二者的成分相同
小明同学骑自行车沿新华大街自西向东运动,看到两面的高楼不断向西运动.能正确说明高楼向西运动,是以下面哪个物体为参照物的( )
若曲线fx=acosx与曲线gx=x2+bx+1在交点0,m处有公切线, 则a+b= ( )
从方框内选择适当的句子补全对话,有两项多余。
A.What do you want to drink?
B.The drinks there are good, aren't they?
C.That's a good place to relax.
D.Why don't we get something to drink.?
E.It is always so crowded there.
F.I like the loud music there.
G.So where would you like to go. Amy?
A: I'm thirsty, Amy.
B: Me too.____
A: Yeah. Let's go to Kangle. I love the soft drinks there.
B: Oh, Sam... I don't like Kangle.
A: Why? ____
B: The drinks are nice. I just don't like its environment. ____ And the loud music makes me feel uncomfortable.
A: OK. ____
B: Let's go to Semi-island. The soft music there makes me feel relaxed.
A: Good idea! ____