2. 外语
  3. Online services work by providing users with ______. If you want to read full-text journals online, you usually have to ______.

Online services work by providing users with ______. If you want to read full-text journals online, you usually have to ______.

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问题 Online services work by providing users with ______.
If you want to read full-text journals online, you usually have to ______.
选项 A、seek for a large amount of information
B、be connected to various databases
C、be introduced by the local library
D、pay a monthly membership fee
答案D
解析 本题为细节题。根据文章第三段第一句话"Besides offering a great number of different information bases，ranging from full-text journal libraries to reports of missing children...”可知，网络服务为使用者提供多种服务，其中包括网上阅读全文期刊。又根据第二句"In exchange for the service，users usually pay a monthly membership fee．”可知，要利用这些服务，使用者通常每月还要交纳一定的费用。因此答案为D。
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