Cho vài viên Zinc vào ống nghiệm chứa dung dịch Hydrochloric acid (HCl) được kẹp trên giá đỡ thì có khí hydrogen (H2) bay ra ngoài và dung dịch Zinc chloride (ZnCl\(_2\)) trong suốt. Hãy cho biết chất và vật thể trong các từ in đậm ở câu trên

Dãy nào sau đây chỉ các vật thể nhân tạo:

A.bức tượng,cái bút chì,cay cau,chiếc xe đạp

B.cây cầu,núi đá,cục tẩy,cây cau

C.con đò,cột điện,chiếc bàn,chiếc áo tơ tằm

D.con gà,viên bi,chiếc vòng,quyển vở

As far as I know, telephone is Bell’s _______.

A

discovery

B

invention

C

machine

D

mobile phone

Câu 2

Deaf-mutes can ________speak ________hear.

A

both… and

B

not only… but also

C

neither… nor

D

either…or street

Câu 3

He was a Scotsman ________ he later moved to Canada .

A

although

B

because

C

so

D

therefore

Câu 4

Bell and his assistant, Thomas Watson, ________ many experiments

A

led

B

came

C

transmitted

D

conducted

Câu 5

At home, I often spend my free time ____________ my mother with the housework

A

help

B

helps

C

helping

D

to help

Câu 6

________ work with deaf-mute patients in a hospital in Boston?

A

What

B

Who

C

How many

D

Where

Câu 7

Telephone helps us communicate with each other over a long ________.

A

place

B

walk

C

space

D

distance

Câu 8

This led ________ the invention of the telephone.

A

about

B

to

C

in

D

at

Câu 9

Alexander Graham Bell was born ________ March 3, 1847 in Edinburgh.

A

on

B

in

C

outside

D

of

Câu 10

Bell started ________with rays of transmitting speech.

A

experiment

B

to experimenting

C

experimented

D

experimenting

Câu 11

He ________ completed his experiment.

A

successful

B

succeeded

C

successfully

D

success

Câu 12

My father ________ to Canada as a young man.

A

emigration

B

emigrated

C

emigrant

D

emigrates

Câu 13

Our city is the biggest ________ center in the country.

A

commercialize

B

commercialization

C

commercial

D

commerce

Câu 14

There was an ________ of painting at the Art gallery.

A

exhibition

B

exhibit

C

exhibitions

D

exhibits

Câu 15

What does this sign mean? 

A

Wash your hands

B

Bare hands only

C

No hands touch

D

Wear protective gloves.

Câu 16

Circle the word that differs from the other three in the position of primary stress.

A

agree

B

assistant

C

arrange

D

countless

Câu 17

Find the word which has a different sound in the underlined part

A

telephone

B

directory

C

invention

D

experiment

Câu 18

+ “Can I speak to Mr. Nguyen, please?” + ___________________.

A

Hold on, please

B

I’m Mr. Nguyen

C

No, you can’t

D

Yes, you can

Câu 19

My silk dress is red and beautiful.
I have___________________

A

have a red beautiful silk dress

B

have a silk beautiful red dress

C

have a beautiful silk red dress

D

have a beautiful red silk dress

Câu 20

This morning is too cold for them to go swimming
This morning is not___________________ for them to go swimming

A

cold enough

B

warm enough

C

enough cold

D

enough warm

Cho ΔABC là tam giác cân tại A.MN lần lượt là trung điểm của AC và AD

a. Chứng minh tam gicas MNCB là hình thang cân

b. Cho BC=50cm,tính MN