单项选择题

A membership list of 720 people shows that 36 have first and last names that begin with the same letter. If a person is selected at random, what is the probability that his or her first and last name does NOT begin with the same letter（）

(A) 0.05
(B) 0.25
(C) 0.50
(D) 0.75
(E) 0.95

<上一题目录下一题>

热门试题

单项选择题

Honesty is not a ______ human attribute, but rather a central virtue, whose existence is seemingly being ______ by selfish desires.

(A) superficial .. undermined
(B) trivial .. enhanced
(C) pervasive .. threatened
(D) worthless .. supported
(E) resilient .. forestalled

单项选择题

The author of the passage is primarily concerned with（）

A．promoting mammalian sleep research
B．documenting the importance of non-REM sleep in hormone regulation
C．describing the role of sleep in human behavior and development
D．arguing that humans need more sleep to function optimally
E． illustrating the importance of REM sleep to brain function