Seal off the street and question everyone ______ （close)

The function of the piston rings is to ________.

A help cool the piston by transferring heat from the piston to the cylinder wall

B provide a sliding seal between the piston and cylinder wall

C scrape oil off the cylinder wall as the piston moves down on the power and intake strokes.

D all of the above

A.Cools the inert gas

B.Maintains the oxygen content at 5% by volume

C.Drains off static electricity in the inert gas

D.Maintains the water seal on the gas main

A.at

B.into

C.off

D.out

A.run into

B.work with

C.deal with

D.run off

I ______ an old school friend in Oxford Street this morning.

A、come into

B、come across

C、come out

D、come off

一Do you know where Liberty Street is？

一 It's off Oak Street, near the park.

—____.

一 I don't know exactly. Perhaps every five minutes or so.

A. The park？ Which one do you mean？

B. Do you have any idea where Pine Street is？

C. By the way, do you know how often the Number 5 bus runs normally？

从右边方格内找出与左边英语短语相匹配的翻译选项

(A)No Littering ( )游人止步

(B)Visiting Declined ( )油漆未干

(C)Staff Only ( )随手关门

(D)Keep off the Grass! ( )单行道

(E)Danger! High Voltage! ( )禁止乱扔废物

(F)Wet Paint ( )勿踏草地

(G)Admission by Ticket Only! ( )谢绝参观

(H)Close the Door Behind You! ( )高压危险

(I)NO Visitors ( )闲人莫入

(J)One-way Street ( )凭票入场

Chokwe Selassie is on a mission to help drivers avoid potholes(路面坑洼). The eighth-grader was inspired to kick off his mission on a recent morning, when his mother was driving him to school. Their car was damaged as it went over a huge pothole in the middle of the street in their hometown of Jackson, Mississippi. "I decided I was going to do something about the pothole prob-lem in my city," Chokwe says. His solution: an app(手机应用) that warns drivers when there is a pothole ahead.

Chokwe developed the app with his friends Rodriguez Ratliff and Emmanuel Brooks. "When the app detects a potheole, it is highlighted(突出显示) in red," Chokwe says. "And if you get close to the pothole, your phone will warn you. " Drivers can also use the app to report any pot-holes" they encounter, and to look for other routes they can take to avoid roads that have them.

The app relies on Current available information about the streets of Jackson. "It works by u-sing the city&39; s 311 call system, so it uses information already stored in a database," Chokwe says.

(79) Through the call system, citizens dial 3-1-1 to report non-emergency problems--whiCh in-clude potholes. Chokwe and his friends determined that focusing on the 10 busiest streets in Jack-son would give them a large enough sample size to test the prototype(原型).

(80) Although the app isn&39; t yet available for sale, Chokwe is already looking for ways to im-prove it. The prototype remains limited&39;to 10 streets in Jackson, but he hopes to add more, so that it includes every street in the city. And then he wants to go even farther. "I want to keep working on the app until it&39; s nationwide," Chokwe says.

Which of the following is the best title for the passage？

A.A Solution to Traffic Jams

B.An App to Detect Potholes

C.Pothole Problems in Big Cities

D.Poor Road Conditions

The phrase kick off in Paragraph 1 is closest in meaning to__________.A.leave

B.invent

C.begin

D.shift

People use the 311 call system to report__________.A.emergencies

B.terrorist attacks

C.non-emergencies

D.child abuse

The prototype focuses on __________ streets in Jackson.A.10

B.15

C.20

D.25

According to the passage, which of the following statements is TRUE？A.Chokwe developed the app all by himself.

B.People can buy this app from the online store.

C.His mother' s car was once damaged over a pothole.

D.The app works by using the city's 911 call system.

请帮忙给出每个问题的正确答案和分析，谢谢！

For some minutes, all was quiet in the street. Then, from across the street, someone came walking.

It looked Like a man of middle height, dressed in a big raincoat, a soft hat and rubber-soled boots or shoes, and making little sound while walking; at most a soft, sliding sound.No one was in sight. it was a street with two rows of about fifty small houses, and there were three lamps on either side. The lamp nearest the child's house could be seen clearly, but the others were almost hidden by the smoke air. A car passed the end of the street and its lights showed faintly, but clearly enough to show the smooth skin of a woman's face. The car disappeared as the woman, wrapped up in her coat, reached the doorway of the child's house.

She put a key in the lock quickly, pushed the door open and stepped inside, then closed the door without looking round. She began to breathe hard.

She leaned against the door for a moment, then straightened up as if with an effort, and walked towards the door of the front room, the passage leading to the kitchen, and the narrow staircase. She hesitated outside the door, then went up the stairs, quickly but with hardly a sound.

There was enough light from the narrow hail to show the four doors leading off a small landing. She pushed each door open in turn and shone a torch inside, and the light fell upon beds, walls, furniture, a bathroom had-basin, a mirror which flashed brightness back; but this was not what the woman was looking for. She turned away and went downstairs, and hesitated again at the foot of the stairs, then turned towards the kitchen. Clearly there was nothing there, or in the small wash-room, that she wanted. Two rooms remained; the front room and a smaller one next to it. She opened the front room door. After a moment, she saw the child's bed and the child

36. The light of the car passing the end of the Street showed that _____.

A. a woman was driving the car

B. someone was standing by a Street lamp

C. a man and a woman were walking up the Street

D. a woman was walking by herself up the street

37. When the woman had closed the front door, she _____.

A. looked round quickly

B. started breathing again

C. rested before moving

D. walked straight towards the front room

38. The woman went upstairs _____.

A. in complete silence

B. alter hesitating for a moment

C. after looking inside the kitchen

D. as quickly as she could

39. When she was upstairs, the woman _____.

A. saw that there was a wash-basin in each room

B. noticed a mirror which she was looking for

C. found a torch inside one of the rooms

D. opened four different doors

40. Once she was in the house, the woman behaved as if what she was looking for _____.

A. might be in the kitchen

B. was more likely to be upstairs

C. would be easily seen by the light from the hall

D. would look frightening to a child

A.can not complete his work in a noisy situation

B.will suffer from complete deafness because of noise pollution

C.can be psychologically affected by working in very noisy factories

D.may cooperate well in a noisy surrounding