皮皮学，免费搜题
登录
搜题
【简答题】
A．The use of insecticides should be limited and controlled. B．A combination of some insecticides should be used at the same time. C．New insects should be introduced to mate with those that have survived from a certain kind of insecticide. D．New kinds of insecticides should be explored and developed.
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】求由摆线x=a(t-sint)，y=a(1-cost)的一拱(0≤t≤2π)与横轴所围成的图形的面积．
【单选题】—Were there ___ sharks in the aquarium? —No, there weren't _____. [ ]
A.
any; any
B.
any; some
C.
some; any
D.
some; some
【单选题】According to the statistics, among the homeless in New York there were ______.
A.
more people in families than single persons
B.
about six thousand families
C.
3 children in family
D.
more families with two parents than one
【单选题】--- ___________ there any sharks in the aquarium? --- No, we didn’t see any.
A.
Did
B.
Had
C.
Have
D.
Were
【单选题】— Were there any dolphins in the aquarium? — ___________. We didn't see any in it. [ ]
A.
Yes, there were
B.
No, there weren't
C.
Yes, there are
D.
No, there aren't
相关题目：