皮皮学，免费搜题
登录
搜题
【单选题】
矩阵 的秩是A.
2
B.
5
C.
4
D.
3
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
【单选题】In the sentence "God would not suffer Mr. Cotton err", the word "suffer" probably means .
A.
force
B.
let or allow
C.
see
D.
hear
【单选题】What's the meaning of "up in the air" in the sentence"Parents aren't sure about how to direct their children, because too much is up in the air."
A.
too difficult
B.
not real
C.
uncertain
D.
too much
相关题目：