A是cheap B是cheaper C是expensive D是more expensiveA是cheap B是cheaper C是expensive D是more expensive,选什么,急

A是cheap B是cheaper C是expensive D是more expensiveA是cheap B是cheaper C是expensive D是more expensive,选什么,急 为什么这里用cheaper,而不是cheap?This blue bike is too expensive.Could you show me a ___one?A.cheap B.cheaper C.cheapest答案是选B.但根据我的理解是A.因为与expensive 相对的是 cheap,而cheaper 是相对cheap而言的. this red sweater is too expensive.can you show me a _ one?A cheap B the cheap C cheaper如上 这是我们英语月考的一个选择题 令我们众多童鞋纠结了很久 = = This watch is _____ than that one.A more cheaper B much cheaper C more cheap D much cheaper不好意思，打错了A more cheaper B much cheap C more cheap D much cheaper The pen is ______ than that one.A.more cheap B.cheap  C.much cheaper D.quite cheaper The pen is ______ than that one.A.more cheap B.cheap  C.much cheaper D.quite cheaper 问便宜的比较级是more cheap 还是cheaper? Traveling by train is usually ____Than traveling by plane.A cheap B cheapest C cheaper D more cheap This picture is ( ) than that one.A.cheaper B.cheap C.cheapest This radio is ______of the three A.cheap B.cheaper C.cheapest D.the cheapest The backpack is c_,but he still can't afford it .填cheap还是cheaper?我写的是 cheaper The pianos in the other shop will be?The pianos in the other shop will be_____,but ________.A cheaper; not as better B more cheap;not as betterC cheaper; not as good D more cheap;not as well我搞不懂的是not as better 和not as good 有何区别, Of the two T-shirts,I will choose _____one to save some money for a book.A.the cheaper B.cheaper C.the cheapest D.cheap traveling by air may be ( ),but not so ( ) A.quicker;cheaper B.more quickly;cheap C.quicker;cheapD.more quickly;cheaper Taking buses in Beijing is ______ than taking a taxi.A.more cheap B.much cheaper C.a little cheap D.less cheaper为什么是选B 其它三个错在哪? now telephone are very popular and they are much________than before.A.cheap B.cheaper C.cheapest D.the cheapest急! The plane is faster than the rain,but it's____.A cheap B cheaper C expensive D more expensive The plane is faster than the train,but it is______ A.cheap B.cheaper C.expensive D.more expensive