问题
单项选择题
骨肉瘤的骨骼变化属于（）
A.骨质疏松
B.骨质软化
C.骨质破坏
D.骨膜反应骨
E.瘤骨
答案
参考答案：C
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骨肉瘤的骨骼变化属于（）
A.骨质疏松
B.骨质软化
C.骨质破坏
D.骨膜反应骨
E.瘤骨
参考答案：C
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| It's March now. It's time 1____________ plant trees (植树). Today is the 2nd of March. The students of 2____________ are planting trees. Some are 3____________. Some are carrying water. 4____________ are watering the trees. All of the students are busy. 5____________ hard all the students are working! They are helping to make our country beautiful.
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