Cảm nghĩ của em về nhân vật bé Thu và tình cha con trong chiến tranh ở truyện Chiếc lược ngà của Nguyễn Quang Sáng. (ko chép mạng càng tốt nha)

Bài 1: So sánh các căn bậc hai số học

a) 1 và\(\sqrt{3}-1\)       b) 2 và \(\sqrt{2}+1\)           c) 2\(\sqrt{31}\)và 10         d)\(\sqrt{2}+\sqrt{11}\)và \(\sqrt{3}+5\)

Bài 3:Cho tam giác ABC cân ở A, có AB=AC=100cm, BC=120 cm hai đường cao AD, BE cắt nhau ở H

a)Tìm các tam giác đồng dạng với tam giác BDH

b)Tính độ dài các đoạn HD, AH, BH, HE

Bài 5:Cho tam giác ABC vuông tại A đường cao AH

a)Chứng minh rằng AB² =BH.BC và AC² =CH.CB

b)Tính chu vi tam giác ABC, nếu BH= 9cm, HC= 16 cm

câu 1 :trình bày phương pháp nhận biết 3 chất lỏng không màu đựng trong 3 lõ bị mất nhãn: nước muối loãng,nước chanh,nước vôi trong bằng phương pháp hóa học

câu 2: trình bày cách làm chất chỉ thị màu từ bắp cải tím

GIÚP MIK ĐI CẦN GẤP LẮM RỒI 

Ex 1. Circle the best option

1. If we go on littering, the environment ...................... seriously polluted.

A. becomes B. will become C. became D. would become

2. Hoa: “I suggest going camping next Sunday” - Lan: …………………………………………..

A. That’s a fineday B. That’s a good idea

C. That’s a reason D. That’s a good trip

3. The new appliance does not only work ................................but also saves energy.

A. effect B. effective C. effectively D. effectiveness

4. In 1876, the telephone ................... first introduced by Bell and Watson.

A. was B. is C. has been D. had been

5. Choose the word which has the underlined part pronounced differently from the others.

A. ranked B. gained C. prepared D. proved

6. I warned him ......................... too close to the fire.

A. didn’t go B. not going C. no going D. not to go

7. Sooner or later a satellite ....................... by a large piece of rubbish.

A. will destroy B. will destroyed

C. will be destroyed D. will been destroyed

8. Choose the words that have the different stress from the others.

A. explorer B. physicist C. scientist D. telephone

Ex2. Rewrite these sentences, begining with the word given.

1. “Do you have many friends?”

Ò She asked me................................................................................................................................

2. We don’t have a lot of money, so we don’t buy a lot of new books.

Ò If we............................................................................................................................................

3. Learning English is not easy.

Ò It is..............................................................................................................................................

4. The doctor examined the patients.

Ò The ..............................................................................................................................

Ex3. Complete the sentences based on the given cues.

1. I /turn/ off/ the /lights /before/ I/ leave/ the/ room.

Ò......................................................................................................................................................

2. Tom/ say/ that/ he /want/ buy / a/ pocket / calculator/ for /father.

Ò......................................................................................................................................................

3. Nga/ read/ the /message/ board/ at 8.00 a.m tomorrow.

Ò......................................................................................................................................................

4. A lot of /money/ spend/ on /advertise/ everyday.

Ò......................................................................................................................................................

Ex4. Choose the word or phrase among A, B, C or D that best fits the blank spacein the following passage.

TELEPATHY: MIND TO MIND COMMUNICATION

The (1) “telepathy” has been derived from the words “tele” meaning“distance” and “pathy” meaning “feeling”. So telepathy actually means getting feelings through a distance. Telepathy is the communication (2) two minds, separated over a distance, without the use of the five knownsenses.

At some point of time or the other, we all have (3) telepathy. Maybe youwere thinking of someone you haven’t talked to for months and you suddenly get a call from them. Or when two people are together, they might say the same thing at the same time. These are spontaneous mind-to-mind (4) that tend to occur frequently between closely related individuals.

1. A. word B. phrase C. letter D. signal

2 A. through B. among C. between D. across

3. A. experienced B. brought C. made D. taken

4. A. ways B. methods C. techniques D. communications

Ex5. Read the following passage and then answer the questions below it.

Air pollution is a cause of ill-health in human beings. In a lot of countries there are laws limiting the amount of smoke which factories can produce. Although there isn’t enough information on the effects of smoke in the atmosphere, doctors have proved that air pollution causes lung diseases.

The gases from the exhausts of cars have also increased air pollution in most cities. The lead in petrol produces a poisonous gas which often collects in busy streets surrounded by high buildings. Children who live in areas where there is a lot of lead in the atmosphere cannot think as quickly as other children and they are clumsy when they use their hands.

There are other long-term effects of pollution. If the gases in the atmosphere continue to increase, the earth’s climate may become warmer. A lot of the ice near the Poles may melt and may cause serious floods.

1. What can make people sick?

_____________________________________________

2. Where does smoke come from?

_____________________________________________

3. Can air pollution cause lung diseases?

_____________________________________________

4. Why does the earth’s climate become warmer?

_____________________________________________