One. 1.A 2。 D 3。 A 4。 D 5。 A six. B 7。 C 8。 B 9。 C 10。 B

Two. 1 1.& gt& lt& gt& gt 12.-8 -2 1/3 13. 15 14.6 15.3 16.447 17.2 18.-a 19.4 -3

Three. 20.-2.5 & lt； - 1 & lt； 0 & lt2/3

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2 1. A: You can choose three people. Because only three people are 170~ 180 cm, and two people are 168 cm and 18 1 cm, which does not meet the standard.

22. A: At this time, the displayed result should be 5, and the entered number is 5.

23. A: Point A represents the maximum number, which is-1.

The latest time for him to leave home after lunch is 12:56.

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1.B 2。 B 3。 A 4。 C 5。 C 6。 -4 - 1. 1 - 1/6 7. 1090 8.-8 - 10 -7/6 -9/2

9.B 10。 The negative phenomenon swims 20 kilometers, then 5 kilometers, then 15 kilometers, and then 10 kilometers.

1 1. A: He is now in the original due west direction, which is 10 meter away from his original position.

12. A: The balance of the enterprise account book is 650,000 yuan.

13.0 8 2

14. 16 33 17 32 -65