1, a section of the road, A walks for several hours, B walks for several hours, so the speed ratio of A and B is ().

A 2: 3, a 3: 2 and a C,

2. Sugar accounts for water, so the ratio of sugar to syrup is ().

a 1 10 B 1 1 1 C

3. In the same place, the shadow length of a 4-meter-high tree is 1.2 meters, and the shadow length of a 3-meter-high tree is () meters.

A 1m B0.9m C0.3m

4. Football is 20% more than volleyball, and the ratio of volleyball to football is ().

A 6︰5 B 5︰6 C 1︰ 12

5. The weight of apples is lighter than that of pears, and the ratio of apples to pears is ().

A 3: 5, a 5: 3 and a 7: 5.

6, than the first and last item ()

A. None of them can be 0 b. All of them can be 0 c. The former item can be 0 d. The latter item can be 0.

7. The school bought 380 books and distributed them to three classes according to a certain proportion. Their ratio may be ().

A.2:3:5 B.2:3:4 C. 1:2:3

8, 3/5: 0.2 into the simplest integer ratio is ().

A. 1:3

9. It takes 30 seconds for a small stick to be sawed into 3 segments and () seconds for a small stick to be sawed into 6 segments.

A.60 B.75 C.90

The attendance rate of 10 can reach ()

A. 10 1%

Second, distinguish carefully, mark "√" for the right and "×" for the wrong. (*** 10 point)

1, the first item and the last item of the ratio add the same number that is not 0 at the same time, and the ratio remains unchanged. ( )

2. Simplify 0.3 ︰ 0.0 1 to get 30︰ 1. …………………………( )

3.20 kg of wheat can grind 15 kg of flour, so the flour yield is 75%. ( )

4. The simplest integer ratio with a ratio of 0.5 is 0.5 ?1. …………………( )

It takes 20 minutes for Xiao Gang to walk the same road and 16 minutes for Xiao Ming. Xiao Gang is faster than Xiao Xiao. ……………………………………………( )