These books,which you can get at any bookshops.

BD都对的
all,both,half三个词后面都可以直接接可数或不可数名词,
如：
all students; all water
One-ninth o fall water on Earth is hydrogen.地球上所有水的九分之一是氢.
（泛指）
也可以加上冠词或指示代词或物主代词：
如：
all the students; all the water
Both the parents are workers.
（特指）
有冠词或指示代词或物主代词时,还可以加of
all of the students,all of the water
Both of the parents are workers.
（特指）
如果是代词前用这三个词,就得加of
all of us; both of us; half of us

实际上都是正确的答案。

你好！
我准确的告诉你，朋友，这个是一个错题。2个都可以选。
只有一种情况只能用all of 不能用all.
当名称是代词的时候比如：
all of us are friends 不能用 all us are friends.
all of them are chirldren. 不能用 all them are chirdren.

希望...