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( )Online friendship with strangers threatens children's safety.

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( )By means of shortening time spent online or placing computers in an obvious area, parents keep close watch on IM.

( )Instant messages usually appear without capital letters, punctuation or complete words.

( )Parents and teachers are afraid that instant messaging can distract children's attention

中国对外商品贸易的主要逆差来源地不包括以下哪个国家或地区?()

A. 澳大利亚
B. 日本
C. 韩国
D. 巴西