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【单选题】
23 To calculate the expected value of an outcome:A.
divide the value of each outcome by its probability, then add the results.
B.
divide the value of the desired outcome by the value all possible outcomes
C.
multiply the value of each outcome by its probability, then add the results
D.
use linear regression to assess the expected value of the outcome
E.
B and D only
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【简答题】已知：（2-x） 6 =a 0 +a 1 x+a 2 x 2 +…+a 6 x 6 ． （1）求a 4 ； （2）求a 0 +a 1 +a 2 +a 3 +a 4 +a 5 +a 6 的值； （3）求|a 0 |+|a 1 |+|a 2 |+|a 3 |+|a 4 |+|a 5 |+|a 6 |的值．
【多选题】What will happen in Grain Rain?
A.
People eat toona sinensis.
B.
People will have a Grain Rain Festival.
C.
People will drink tea.
D.
Sandstorms may occur.
【单选题】They have produced they did last year.
A.
twice more grain as
B.
twice as much grain as
C.
twice as many grain as
D.
as twice many grain as
【简答题】求下列各式的值： （1）- =（ ）；（2） =（ ）；（3）± =（ ）； （4）- =（ ）；（5） =（ ）；（6）- =（ ）
【简答题】A．gain B．gang C．giant D．grain
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