皮皮学，免费搜题
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【单选题】
用过锥顶的平面截切圆锥体,截平面与圆锥表面的截交线形状为( )A.
直线
B.
圆
C.
椭圆
D.
无法判断
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Regular exercise is a good habit for kids to ___________.
A.
develop
B.
break
C.
become
D.
grow
【单选题】Adam Smith mentioned the number 4 800 in order to ______.
A.
show the advantages of the division of labor
B.
emphasize how powerful the individual worker was
C.
show the advantages of the old craft system
D.
emphasize the importance of increased production
【单选题】64-Unit 11 Activity 4.mp3: What was the main focus of the survey?
A.
Leisure sporting activities.
B.
Average age of athetes.
C.
Durability of sporting equipment.
相关题目：
【单选题】Regular exercise is a good habit for kids to ___________.
A.
develop
B.
break
C.
become
D.
grow