正确答案: A

铁

题目：“金银铜铁锡”俗称五金。在这五种金属中，金属活动性最强的是

解析：A

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学习资料的答案和解析：

[单选题]Whose bike is this?--- It ______ belong to Adam. Look! His bag is on it.

must

[单选题]17．

for

解析：17.A【解析】go for a drive意为“开车兜风”，为固定词组。

[单选题]Can you speak English _______ ?—Yes，l can．

well

解析：1．B【解析】副词well修饰行为动词speak；其他三项是形容词，不能修饰动词。

[单选题]AIf you go to a fast food restaurant．you will probably see a lot of teenagers． Today，many teenagers are overweight，and some of．this is because of their bad eating habits．， Most teenagers love food with a lot of fat，oil，salt，and sugar． People often call this kind of food "junk food"．

fat，oil，salt and sugar

解析：．21．D【解析】由第一段最后两句Most teenagers love food with a.lot of fat，oil，salt，and sugar. People of- ten call this kind of food“junk food".可知。