Cho các chất sau: anđehit fomic, etanal, propanal, anđehit oxalic, anđehit benzylic. Số chất tác dụng với dung dịch A g N O 3 / N H 3 theo tỉ lệ 1 : 4 là

A. 1.

B. 2.  

C. 3. 

D. 4.

Cho các chất sau: anđehit fomic, etanal, propanal, anđehit oxalic, anđehit benzylic. Số chất tác dụng với dung dịch A g N O 3 / N H 3 theo tỉ lệ 1 : 4 là

A. 1.

B. 2.  

C. 3. 

D. 4.

A good leader in globalization is not to impose but change.

A. facilitate 

B. show 

C. cause 

D. oppose 

We should participate in the movements _____ the natural environment. 

A. organizing to conserve

B. organized conserving 

C. which organize to conserve 

D. organized to conserve

Students __________ use their dictionaries during the test. It's against the rules.

A. mightn't 

B. mustn't 

C. oughtn't 

D. needn't 

Thay dấu * bởi chữ số thích hợp:

a, *. * * = 106

b,  * * . * * = 377

Hasan and Huckfin are talking after finishing their final test.

Hasan: “The test results will be released at 9 a.m tomorrow!”

Huckfin: “Will it?_________”

A. Can I wait for it?

B. Could it wait?

C. Yes, please.

D. I can’t wait!

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

A.tuition    

B. educate

C. physical  

D. summary 

_________in 1937, the Golden Bridge spans the channel at the entrance to San Francisco Bay.

A. Completed

B. Completing

C. being completed

D. to be completed