C.这道题可以这样改写the weather in shanghai is better than _the weather__ in beijing in summer.
the weather 是不可数名词所以用that代替
A是特指：指同一物.I have a dog,Ilike it.这里it指a dog
B.在这类题目中代替复数.Thepeople in China are more helpful than those in America
D.特指同类不同物.His cat is black.the one in the box is white