题目内容：
Which of the following is true of the LoB when it opens?a. It offers better learning tools
b. It reaches users in different ways
c. It provides users with smart phone
d. It allows users to enrich its material
e. It gives non-stop physical and digital services A．a,b,d
B．a,c,e
C．b,c,d
D．b,d,e
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答案解析：