问题
选择题
已知p：∅⊆{0}，q：{1}∈{1，2}．由他们构成的新命题“p∧q”，“p∨q”，“￢p”中，真命题有（ ）
A．1个
B．2个
C．3个
D．4个
答案
由集合之间的关系得：
命题p：∅⊆{0}是真命题，命题q：{1}∈{1，2}是假命题，
所以p∧q是假命题，p∨q真命题，命题p是假命题，
故选A．
搜题请搜索小程序“爱下问搜题”
已知p：∅⊆{0}，q：{1}∈{1，2}．由他们构成的新命题“p∧q”，“p∨q”，“￢p”中，真命题有（ ）
A．1个
B．2个
C．3个
D．4个
由集合之间的关系得：
命题p：∅⊆{0}是真命题，命题q：{1}∈{1，2}是假命题，
所以p∧q是假命题，p∨q真命题，命题p是假命题，
故选A．
| 阅读理解。 | ||||
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| 1. Who is suitable to work as a Community Representative in YOUTH International? | ||||
| A. One who enjoys working with teenagers from different countries. B. One who hopes to take action in fighting against diseases. C. One who has a strong desire to improve his or her English. D. One who wants to earn some pocket money in the program. | ||||
| 2. Where will Jack, a volunteer, receive the training before he is sent to work in Malawi? | ||||
| A. In some local offices in the U.S. B. In an ESL organization in China. C. In a preparation program in Denmark. D. In an exchange student center in Africa. | ||||
| 3. If Mrs. Black in the U.S. hopes to learn some Chinese at home, she may contact _____. | ||||
| A. takeaction@betterworld.com B. ram3462@hotmall.com C. club3864@hotmail.com D. staff@youth.org | ||||
| 4. What are volunteers for an experiment over the Internet supposed to do? | ||||
| A. To interview people online. B. To do some housework. C. To offer advice on Child Aid. D. To provide language exercises. |