【单选题】下列说法中正确的是( )
A.
第 3 周期所包含的元素中钠的第一电离能最小
【简答题】钠的第一电离能高于钾,但通过下列反应却可以制备金属钾。为什么? KCl(熔)+Na=NaCl(熔)+K
【单选题】Why do the scientists want to find the missing amphibians?
A.
Because they want to rescue the missing amphibians.
B.
Because they want to set up a scientific program.
C.
Because they want to do a scientific research on the missing amphibians.
D.
Because they want to publish a report about the missing amphibians on WR News.
【单选题】Most amphibians hatch from eggs laid in water or moist ground, and begin life ____ water-dwelling larvae.
【单选题】According to the speaker, why do pesticides pose a threat to amphibians?
A.
Pesticides can cause an amphibian's skin to dry out.
B.
Pesticides kill the insects that amphibians depend on for food.
C.
Dissolved pesticides can easily enter amphibian's bodies.
D.
Amphibians may eat plants that have been treated with pesticides.
【单选题】在我国的收入分配中,兼顾效率与公平就应当正确处理先富和共富的关系。假如你是先富起来的个人,应该做到()
A.
通过个人高消费来缩小与其他社会成员的收入差距
C.
在个人创业致富的同时,带动和帮助后富,发扬奉献精神,回报社会
D.
遵纪守法,个人致富等待国家调节与其他社会成员的收入差距