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【判断题】
缺乏弹性的价格与销售收入呈同方向变化。A.
正确
B.
错误
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】--- Let’s go to play football, shall we? --- Sorry, I can’t. I must go over the points the teacher explained ______ I forget them.
A.
after
B.
when
C.
before
D.
since
【单选题】He suggests we _____ to the cinema at once, otherwise we _____ late. [ ]
A.
must go; are
B.
go; will be
C.
will go; will be
D.
would go; are
【单选题】— Must we wear our school uniform this afternoon? — No, you . All of us will go on an outing.
A.
mustn't
B.
can't
C.
needn't
D.
couldn't
【单选题】-----Why ________ you come and play basketball with us? -----Because I have lots of homework to do.
A.
not you
B.
not
C.
not to
D.
don’t
【单选题】— ____ we go to help him with his work? —No, you needn’t. He ____ finish it all by himself.
A.
Must; can’t
B.
May; can
C.
Must; can
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