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【单选题】
Read the following paragraph from the introduction [paragraphs 1-4]. This happens in the United States. It is not that easy in some places. More than half of the world's people have never been online. That is what the United Nations says. The United Nations is a group that helps countries work together. What is the focus of this paragraph?A.
why people use the Internet
B.
what the United Nations is
C.
who can use the Internet
D.
when people use the Internet
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皮皮学刷刷变学霸
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【简答题】物质在细胞内进行的一系列分解、合成、转变等化学过程称为 。
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