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

题目内容：

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

参考答案：

答案解析：

The vaccine activates the immune system.

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

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分类：卫生类题型：单选题