搜题请搜索小程序“爱下问搜题”
问题 选择题
一枚骰子连续掷了两次，则点数之和为2或3的概率是（　　）
A．
1
12
B．
1
9
C．
1
8
D．
1
6
答案

如图所示：

共有36种情况，点数之和为2或3的情况为11，12，21，共三种，

于是P（点数之和等于4）=

3
36
=
1
12
．

故选A．

单项选择题

(一)


Right is right. Right Of course. But is left wrong Well, the Romans used to think so. They thought left-handed people were mistakes of nature. Latin, the language of the Romans, had many Words that expressed this view. Some words we use today still have this meaning. The Latin word "dexter" means "right". The English word "dexterous" comes from this word. It means "handy" ( clever with hands). So, right is handy. But the Latin word for left is "sinister". The English word "sinister" comes from this word. Sinister means "evil" (very bad). Is it fair to call right-handed people handy and: left-handed people evil Well, fair or not, many languages have words that express such beliefs. In old English, the word for left means "weak". That isn’t much of an improvement over "evil".
Not very long ago, children were often forced to write with their right hands. Doctors have since found that this can be very harmful. You should use the hand you were born to use.
People who use their left hands are just starting to get better treatment. But why they get all these bad names in the first place One reason may be that there are not as many left-handed people as there are right-handed people. There is one left-handed person for every five right- handed ones. People who are different are often thought to be wrong. But attitudes do seem to be changing. Fair-minded right-handed people are finally starting to give left-handed people a hand.

The last sentence of this article means ______.

A．fair-minded right-handed people want to change the habit of the left-handed people

B．fair-minded right-handed people are starting to help the left-handed people

C．fair-minded right-handed people are starting to use left hand to write and so on

D．fair-minded right-handed people are starting to give up using their left hands
查看答案
单项选择题

When embedding SQL in a C language program, the prefix that should be added to all SQL statements in order to distinguish SQL statements from the host language statements is( )。

A．:

B．DECLARE

C．EXEC SQL

D．SQL
查看答案