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【单选题】
成熟B细胞表达的mIg主要为A.
mIgA
B.
mIgM
C.
mIgM和mIgD
D.
mIgG和mIgD
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反馈参考答案：
举一反三
【多选题】关于Internet，下列说法正确的是
A.
Internet是全球性的国际网络
B.
Internet的用户来自同一个国家
C.
通过Internet可以实现资源共享
D.
Internet存在网络安全问题
E.
Internet起源于英国
【简答题】完型填空。 Fire can help people in many ways. But it can also be very harmful(有害的). Fire can keep your house__ 1 __, give light and cook food. ___ 2 __ fire can burn things, too. Big fire can burn trees, a...
【简答题】听对话，回答问题。 1. How long can you keep the books you borrowed from the library? A. 3 days. B. 4 days. C. 5 days. 2. How many times does the library open every day? A. Once. B. Twice. C. Three times. 3. Wh...
【简答题】完形填空。 Fire can help people in many ways. But it can also be very harmful (有害的). Fire can keep your house 1 , give light and cook food. But fire can burn things, 2 . Big fire can burn trees, houses, an...
【简答题】完形填空。 Fire can help people in many ways. But it can also be very harmful (有害的). Fire can keep your house 1 , give light and cook food. But fire can burn things 2 . Big fire can burn, trees, houses, an...
【简答题】I. 听力题 第一节 听下面 5 段对话,每段对话后有一个小题。从题中所给的 A、B、C 三个选项中选出最佳选项。听完每段对话后,你都有 10 秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 1. Where does the conversation most probably take place? A. At a theater. B. At a restaurant. C. A...
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