Một người đứng ở sân ga nhìn đoàn tàu chuyển bánh nhanh dần đều. Toa (1) đi qua trước mặt người đó trong t (s). Hỏi toa thứ n đi qua trước mặt người đó trong bao lâu ?

Hạt nhân của nguyên tử là nơi tập trung gần như toàn bộ khối lượng của nguyên tử nhưng bán kính rất nhỏ cớ 10^-5 nm. Coi hạt nhân là một khối cầu, tính thể tích của hạt nhân theo đơn vị cm³

Nguyên tử H có dạng khối cầu với bán kính 0,053 nm. Tính thể tích của nguyên tử H theo đơn vị cm³

Thực hiện phép tính rồi so sánh: a) 245 + (-12) và 124; b) (-234)+ 45 và -234; c) (-34) + (-56) và -34; d) 17 + (-35) và -17 + 35

Cho hình vẽ dưới đây

Độ dài đường gấp khúc DEFGH là  cm

Certificates provide proof of your _______.

A. qualifications

B. diplomas

C. ambitions

D. qualities

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.

Under the global "health for all" strategy, WHO (the World Health Organization) and its members have placed special emphasis (31) _______ the developing countries. Nevertheless, the benefits of WHO's international health work are benefited by all countries, including the most developed ones. For example, all nations have benefited from their contributions to the WHO programs that led to the global (32) ______ of smallpox and to better and cheaper ways of controlling tuberculosis.

Prevention is a key word in WHO's programs. The organization believes that immunization, (33) _______ prevents the six major diseases of childhood-diphtheria, measles, poliomyelitis, tetanus, tuberculosis, and whooping cough-should be availabe to all children who need it. WHO is leading a worldwide campaign to provide effective immunization for all children in (34) ______ with UNICEF. Provision of safe drinking water for all is one of the objectives of the International Drinking Water Supply and Sanitation Decade proclaimed by the UN General Assembly in 1980 and (35) ______ by WHO. WHO is also active in international efforts to combat the diarrhea] diseases, killers of infants and young children. The widespread introduction of oral rehydration salts, together with improved drinking water supply and sanitation will greatly reduce childhood mortality from diarrhea.
Điền vào ô 34.

A. organization

B. establishment

C. cooperation

D. protection

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.

Under the global "health for all" strategy, WHO (the World Health Organization) and its members have placed special emphasis (31) _______ the developing countries. Nevertheless, the benefits of WHO's international health work are benefited by all countries, including the most developed ones. For example, all nations have benefited from their contributions to the WHO programs that led to the global (32) ______ of smallpox and to better and cheaper ways of controlling tuberculosis.

Prevention is a key word in WHO's programs. The organization believes that immunization, (33) _______ prevents the six major diseases of childhood-diphtheria, measles, poliomyelitis, tetanus, tuberculosis, and whooping cough-should be availabe to all children who need it. WHO is leading a worldwide campaign to provide effective immunization for all children in (34) ______ with UNICEF. Provision of safe drinking water for all is one of the objectives of the International Drinking Water Supply and Sanitation Decade proclaimed by the UN General Assembly in 1980 and (35) ______ by WHO. WHO is also active in international efforts to combat the diarrhea] diseases, killers of infants and young children. The widespread introduction of oral rehydration salts, together with improved drinking water supply and sanitation will greatly reduce childhood mortality from diarrhea.

Điền vào ô 31.

A. on

B. in

C. for

D. with

Trong các khẳng định sau, khẳng định nào đúng, khẳng định nào sai ?

a, Mọi số nguyên tố đều là số lẻ ;

b, Nếu a.b là hai số tự nhiên lớn hơn 1 thì a.b là hợp số;

c, Tổng của hai số nguyên tố là hợp số

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

You have just passed your exam. This makes your parents happy.

A. Having just passed your exam making your parents happy.

B. You have just passed your exam makes your parents happy.

C. That you have just passed your exam makes your parents happy.

D. You have just passed your exam which it makes your parents happy.