Góc A = sin²1⁰+...+sin²99^o

Chứng tỏ rằng nếu p là số nguyên tố lớn hơn 3 và 2p + 1 cũng là số nguyên tố thì 4p + 1 hợp số

Read the following pasage and mark the letter A. B, C or D on your answer sheet to indicate the correct answer to each of the questions from 41 to 48.

Another critical factor that plays a part in susceptibility to colds is age. A study done by the University of Michigan School of Public Health revealed particulars that seem to hold true for the general population. Infants are the most cold-ridden group, averaging more than six colds in their first year. Boys have more colds than girls up to age three. After the age of three, girls are more susceptible than boy's , and teenege girls average three colds a year to boy’s two.

The general incidence of continues to decline into maturity. Elderly people who are in good health have as few as one or two colds annually. One exception is founds among people in the twentics, especially women, who show a rise in cold infections, because people in this age group are most likely to have young children. Adults who delay having children until thirties forties experience the same sudden increase in cold infections.

The study also found that economics play an important role. As income increases, the frequency at which are reported in the family decreases. Families with the lowest income suffer about a third more colds than families at the lower end. Lower income generally forces people to live in more cramped quarters than those typically occupied by wealthier by wealthier people, and crowding increses the opportunities for the cold virus totravel from person to person. Low income may also adversely influence diet. The degree to which poor nutrition affects susceptibility to colds is not yet clearly established, but an inadequate diet is suspected of lowering resistance generally.

(source: TOEFL reading)

Which of the following is closet in meaning to the word “particulars” in line 22?

A. Minor errors

B. specific facts

C. small distinctions

D. individual people

Một trang trại nuôi 325 con gà, số vịt nhiều hơn số gà là 63 con. Số vịt của trang trại đó là:

A. 955 con vịt

B. 388 con vịt

C. 378 con vịtD. 488 con vịt

D. 488 con vịt

Điền số thích hợp vào chỗ trống.

 Số 999 gồm  trăm  chục  đơn vị

Con hãy tìm từ ngữ chỉ hoạt động trong câu sau:

Chủ quán dọn dẹp sạch phần thức ăn vương trên bàn.

Cây chuyển sang phân giải kị khí khi nồng độ oxi không khí giảm xuống

A. 20%

B. 5%

C. 15%

D. Không xác định được

Từ tượng thanh là?

A. Là những từ gợi tả hình ảnh, dáng vẻ, trạng thái… của sự vật.

B. Là những từ gợi tả âm thanh của sự vật, hiện tượng.

C. Là những từ có nhiều nghĩa, ngoài nghĩa gốc.

D. Là những từ mô phỏng hình ảnh, dáng vẻ, trạng thái của sự vật, hiện tượng.

Read the following passage carefully, and then select the best option A, B, C or D to complete it

Conservation, sustainable use and protection of (1) _______ resources including plants, animals, mineral deposits, soils, clean (2) _______, clean air, and fossil fuels such as coal, petroleum, and natural gas. Natural (3) _______ are grouped into two categories, renewable and nonrenewable. A (4) _______ resource is one that may be replaced over time by natural processes, (5) _______ fish populations or natural vegetation, or is inexhaustible, such as (6) _______ energy. The goal of renewable resource conservation is to ensure (7) _______ such resources are not consumed faster than they are (8) _______. Nonrenewable resources are those in limited supply that cannot be replaced (9) ______ can be replaced only over extremely long (10) _______ of time. Nonrenewable resources include fossil fuels and mineral deposits, such as (11) _______ ore and gold ore. Conservation activities for nonrenewable resources focus (12) _______ maintaining an adequate supply of these resources well into the future.

Natural resources are conserved for their biological, economic, and recreational values, (13) _______ their natural beauty and importance to local cultures. (14) _______, tropical rain forests are protected for their important role in both global ecology and the economic livelihood of the local culture; a coral reef may be (15) _______ for its recreational value for scuba divers; and a scenic river may be protected for its natural beauty....

Question 26:

A. solar

B. earthly

C. lunar

D. polar