单选题：When the writer says "critical period", he means a period w

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题目类型：单选题
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When the writer says "critical period", he means a period when__________. A．studies produce useful results
B．adults need to be taught like children
C．language learning takes place effectively
D．immigrants want to learn another language

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Those who always look on the bright side of life are more l

Those who always look on the bright side of life are more likely to __________.

分类：卫生类题型：单选题

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Paragraph 4 __________

Paragraph 4 __________A．Potential dangers of music therapy B．Increase in general

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The low-income children are very grateful to the dentists.

The low-income children are very grateful to the dentists.A．Right B．Wrong C．Not

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The vaccine activates the immune system.

The vaccine activates the immune system.A．Right B．Wrong C．Not mentioned

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Society is now much more diverse than ever before.

Society is now much more diverse than ever before.A．colorful B．attractive C．flex

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