—Can a plane fly__________ the Atlantic Ocean?
—Yes, but it needs to go_______ the clouds for hours.
A:across, through
B:through, across
C:across, across
D:through, through
x
2
4
5
6
8
y
30
40
60
50
70
A:Hi, Li Ming.
B:Hi, Mrs Li.
A:What are you doing?
B:I'm reading a story book. What are you doing?
A:I'm writing a letter. May I look at your story book?
B:Certainly. Here you are.
A:Thank you.
用基因组成是Aa的青州蜜桃枝条为接穗,嫁接到基因组成为aa的青州蜜桃砧木上,所结蜜桃果肉细胞的基因组成为Aa的概率是( )
下列解决生活中实际问题的方法与相应科学原理不对应的是( )
选项
方法
科学原理
A
用酒精洗涤油污
油污能溶解在酒精中
B
醋除去热水瓶中的水垢
水垢能溶解在醋酸里
C
锅盖盖灭着火的油锅
温度降低到着火点以下
D
铝制容器不能盛酸性物质
酸性物质会破坏铝的氧化膜,进而腐蚀金属铝