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幼儿园课程的特点有哪些？

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煤经过接触变质后形成的石墨矿床是变成矿床。()

The authors attitude towards new technologies is______.

A. skeptical
B. welcoming
C. positive
D. ambivalent

What caused the differences in the density of matter to grow larger？

A. Gravitational attraction.
B. Little differences in the density of matter.
C. The big bang.
D. Massive stars.

现代热水喷流活动的大地构造背景分为大洋中脊、洋内弧后、陆内弧后和陆内裂谷四类。()