问题 解答题
只列式,不计算
(1)车队要运245吨货,4小时运了140吨,照这样计算,运完剩下的货还需要多少小时?
(2)新建一条高速公路,已建好了15千米,还剩下全长的
5
8
,这条公路全长多少千米?
(3)实验员把一些酒精分装在三个瓶子里,第一个瓶子装了3
3
4
升,第二个瓶子装的是第一个瓶子的
13
15
,第三个瓶子装了4升,请问这些酒精一共有多少升?
答案

(1)(245-140)÷(140÷4),

=105÷35,

=3(小时);

答:运完剩下的货还需要3小时.

(2)15÷(1-

5
8
),

=15÷

3
8

=40(千米);

答:这条公路全长40千米.

(3)3

3
4
+3
3
4
×
13
15
+4,

=

15
4
+
13
4
+4,

=7+4,

=11(升);

答:这些酒精一共有11升.

单项选择题

I got a job teaching special education at a school in Coachella, California, a desert town about 170 miles from home. It was no (1) job. Street gangs (2) around the school after dark.

"Be careful, " Dad warned me during one of my frequent weekend (3) home. He was concerned about my living (4) , but I needed to be on my own.

One evening, I stayed after school to rearrange my classroom. (5) , I turned out the light and closed the door. Then I (6) toward the gate. It was (7) ! I looked around. Everyone had gone home.

After (8) all the exits, I found just enough (9) to squeeze under a gate in the back of the school. Then I walked toward my car, parked in a field behind the building.Suddenly I heard voices. I (10) around and saw at least eight boys following me. (11) my pace, I reached into my shoulder bag to get my key. I (12) all over the inside of my handbag. But the key wasn’t (13) ! Dear Lord, please help me, I prayed (14) . Suddenly, my fingers touched a loose key in my purse. I didn’t even know if it was for my car, but I took it out and (15) it. It worked!I opened the door, slid in and locked it—just (16) the teenagers surrounded the car. Trembling , I started the engine and (17) away. When I returned to my apartment, the phone was ringing. It was my Dad. I didn’t tell him about my experience; I didn’t want to (18) him. "Oh, I forgot to tell you!" He said, "I had a (n) (19) car key made and slipped it into your purse—just (20) you ever need it.

15()

A.pushed 

B.turned 

C.tried 

D.opened

多项选择题