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92.I wonder why Jenny [ ] to us recently. We should have heard from her by now.

A. hasn't written
B. doesn't write
C. won't write
D. hadn't written

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91.[ ] in April 2011 by graduates from Shenzhen Institute of Information Technology, SZIIT Travel Agency (STA) is one of the leading companies run by college students.

A. Founding
B. Founded
C. Having founded
D. Being founded

甲产品产量与单位成本的相关系数是 ,乙产品的产量与单位成本的相关系数是0.8,因此乙比甲的相关程度高。()

10个同学的成绩不同,因此存在10个变量。()

连续型变量的分组,只能是组距式的。()