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【简答题】
由M(1,1),N(5,-5)两点确定的直线的斜率为________.
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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】Jack Chan is very modest. He never _______.
A.
shows off
B.
shows on
C.
show off
D.
show on
【单选题】The chairperson is very modest.He never_________.
A.
show off
B.
shows on
C.
shows off
D.
show on
【单选题】----Peter has good grades in all his subjects, but he never shows off. ----I agree. He is very ________.
A.
easy-going
B.
imaginative
C.
modest
D.
generous
【单选题】推销人员与顾客顺利成交后,以下分手方式不正确的是:
A.
有节制的表示感谢，不能眼巴巴的盯着顾客签字
B.
适度称赞顾客
C.
推销员应明确地告诉顾客，愿意跟顾客成为长期朋友
D.
以胜利者自居
【单选题】Tom is very modest. He never ___________ before his friends.
A.
shows off
B.
shows up
C.
turns off
D.
turns on
【单选题】Daniel is very modest. He never __________ before his friends.
A.
shows off
B.
shows up
C.
turns off
D.
turns on
【单选题】Jim off the lights and then left the classroom.
A.
was turn
B.
had turned
C.
has turned
D.
was turned
【单选题】Which cell has the shortest life( )
A.
spermatogonia
B.
primary spermatocyte
C.
secondary spermatocyte
D.
spermatid
E.
sperm
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