Số lớn nhất trong các số 5571; 6571; 5971; 6570

A  5571

B. 6571

C.  5971

D.  6570

Nowhere in the northern section of the United States ________ for growing citrus crops.

A. is there suitability of the climate

B. where the climate is suitable

C. the climate is suitable 

D. is the climate suitable

The cosmopolitan flavor of San Francisco is enhanced by ______ shops and restaurants.

A. its many ethnic

B. its ethnicity

C. ethnicity

D. an ethnic

English teaching is considered a good example of a volunteer job which often turns ______ a career.

A. off

B. up

C. on 

D. into

Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.

Her living conditions were difficult. However, she studied very well.

A. Difficult as her living conditions, she studied very well. 

B. She studied very well thanks to the fact that she lived in difficult conditions.

C. She studied very well in spite of her difficult living conditions. 

D. Although she lived in difficult conditions, but she studied very well.

Dựng góc nhọn α,biết:

a, sinα =  3 5

b, cosα =  4 7

c, tanα =  3 2

d, cotα =  5 6

Vẽ góc xOy có số đo bằng 45 ° . Lấy điểm A bất kì nằm trong x O y ^ . Qua A vẽ đường thẳng d vuông góc với tia Ox tại B, đường thẳng d' vuông góc với tia Oy tại C và đường thẳng d" đi qua A và vuông góc với BC.

They knew that it was just not feasible ________such a small firm to compete with the big boys.

A. in

B. at

C. for 

D. about