填空题

The passage mainly tells us that the global warming is a threat to our environment.

【参考答案】

NG
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问答题
说明图中所表示出的现象。2．分析出现该现象的原因。3．说明近年来青少年在网络运用方面存在的问题，并提出相应的对策。
单项选择题
The Greek alphabet was simpler than the Egyptian system for all the following reasons EXCEPT that ______.
A．the former was easy to write
B．the former was easy to spell
C．there were fewer signs in the former
D．each sign stood for only one sound
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