亚马逊表示，今年前三个月的利润与2019年相比下降了29%。 A: Amazon said that its profit for the first three months of this year decreased by 29% compared with that in 2019. B: Amazon said its profit during the first three months of this year were down 29% from 2019. C: Amazon said the profit of the first three months is 29% decreased than 2019. D: Amazon said its profits for the first three months of this year plunged by 29% compared to 2019.

A normal year has 12 lunar months with about _____ days in each month, and during the leap year an extra month is added.（ ）。 A: 29 B: 28 C: 31 D: 30

29 How many US universities are there in the top 100 list this year（） A: More than 30. B: More than 50. C: More than 20,

For economic reasons, The Lord of the Rings was published in volumes over the course of a year from 29 July 1954 to 20 October 1955. These volumes were titled and The Return of the King.

The number of students participating in online courses varies 　. A: year to year B: year and year C: year by year D: year on year

This year is the year of Gengzi, and next year is the year of ___________.

判定year是否为闰年的表达式是 A: year % 400 == 0 or year % 4 == 0 and year % 100 <> 0 B: year % 400 == 0 or year % 4 == 0 , year % 100 != 0 C: year % 400 == 0 or year % 4 == 0 and year % 100 != 0 D: year % 400 == 0 or year % 4 == 0 , year % 100 <> 0

21（） A: next year B: that year C: this year D: by year

使用变量year代表年份，以下表示判断year是否为闰年的布尔表达式是 。 A: (year % 4 == 0) and (not(year % 100 == 0)) or (year % 400 == 0) B: (year % 4 == 0) and (not(year % 400 == 0)) or (year % 100 == 0) C: (year % 4 == 0) and (year % 100 == 0) or (year % 400 == 0) D: (year % 4 == 0) or (not(year % 100 == 0)) and (year % 400 == 0)

题:(拓展)下面哪些表达式能够判断某年year不是闰年。 A: not(( year%4==0 and year%100 !=0 ) or ( year%400==0 )) B: not( year%4==0 and year%100 !=0 ) and not ( year%400==0 ) C: year%4!=0 or year%100 ==0 and ( year%400 !=0 ) D: year%4==0 and year%100 !=0 or ( year%400==0 )