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问题
填空题
一粒玉米的干种子,把它丢进水中,其主要靠()吸水。
答案
参考答案:吸涨吸水
选择题
______ people in the world are sending information by E-mail every day.
A.Tens of thousands of
B. Ten thousands of
C. Several millions
D. Many million
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填空题
注意是心理活动对对象的()和集中。
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