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【单选题】
已知椭圆 x 2 4 + y 2 =1 的焦点为F 1 、F 2 ，在长轴A 1 A 2 上任取一点M，过M作垂直于A 1 A 2 的直线交椭圆于P，则使得 P F 1 ? P F 2 ＜0 的M点的概率为（ ）A.
2 3
B.
2 6 3
C.
6 3
D.
1 2
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举一反三
【多选题】Total compensation package refers to
A.
old age pension
B.
vacation
C.
salary
D.
commission
【单选题】The following services must be _______ to the tourists by a local guide.
A.
offered
B.
offer
C.
offers
D.
offering
【单选题】Which of the following refers to the commission of acts involving a computer that may not be illegal but that are considered unethical?
A.
Computer abuse
B.
Computer crime
C.
Computer literacy
D.
Computer syndrome
【单选题】Which term refers to the fixed amount in a salesperson's compensation?
A.
bonus
B.
commission
C.
salary
D.
incentive
E.
profit-sharing plan
【简答题】体育教师的工作特点是什么?
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