A. opened B. rolled C. sharpened D. widened

37_______

A.brave B.excited C.eurious D.grew

下列说正确的是

A．形成离子键的阴阳离子间只存在静电吸引力

B．HF、HCl、HBr、HI的热稳定性和还原性均依次减弱

C．第三周期非金属元素含氧酸的酸性从左到右依次增强

D．元素周期律是元素原子核外电子排布周期性变化的结果

How did Andy avoid the bees in the end?

A. He asked Mr. Nelson in help.

B. He hid himself under the water.

C. He rushed into the Nelson house.

D. He rode off in the oppossnte ditcction.

（8分）【化学—物质结构与性质】

碳族元素包括C、Si、Cu、Sn、Pb。

（1）碳纳米管由单层或多层石墨卷曲而成，其结构类似于石墨晶体，每个碳原子通过_________杂化与周围碳原子成键，多层碳纳米管的层与层之间靠_________结合在一起。

What does“the days”in Paragraph 3 refer to?

A.I maginary life

B.Simple life in the past

C.Times of inventions

D.Time for constant activity