单项选择题

A．They defend the bone against viruses.
B．They prevent oxygen from entering the bone.
C．They break down bone tissue.
D．They connect the bone to muscle tissue.
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单项选择题
A．City life is much the same in many parts of the world.B．In the United States, farm families live on their own farms.C．In many parts of the world, farmers live in villages.D．Farmer families in the United States have more children than families in the city.
A．City life is much the same in many parts of the world.
B．In the United States, farm families live on their own farms.
C．In many parts of the world, farmers live in villages.
D．Farmer families in the United States have more children than families in the city.
单项选择题
Activities such as painting, dancing and singing should not be regarded as play .
A．Y
B．N
C．NG
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