题目内容

Sophia Sparks prefers the term “inspirational tree climbing” because it ____________.

A. provide people with more chances to play outside
B. bring a lot of pleasure to life
C. deepens personal love between each other
D. makes people realize they should protect trees

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What’s the best title for the passage?

A. Tree-climbing travelling
B. Slow travel movements
C. Dangers of climbing
D. Respect for nature

下列哪组分子是由极性键组成的非极性分子

A. CH4 CO2
B. CH4 NH3
C. NH3 H2O
D. N2 O2

下列各物质其分子之间只存在色散力的是

A. CO2
B. NH3
C. H2S
D. HF

CO2分子无偶极距,说明

A. CO2分子是直线构型。
B. CO2分子是直线构型,氧原子对称分布在碳原子两旁。
CO2分子稳定。
D. 碳原子和氧原子之间键的极性很小。