Có lớp ô dôn -> ngăn những tia bức xạ gây hại cho sinh vật và con người

Chúc bn làm bài tốt

ai cg đẹp trai nhưng cái thằng cuối cg hơi trẻ trâu

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Leonardo is often (A) thought of primarily as an artist, and (B) with masterpieces such as The Last Supper and the Mona Lisa (C) to his credits, his (D) place in art history is assured.

A. thought of

B. with 

C. to his credits

D. place 

Chuẩn

Tế bào đang ở giai đoạn

A. Kì giữa nguyên phân

B. Kì giữa giảm phân

C. Kì đầu nguyên phân

D. Kì đầu giảm phân

c2: Áp dụng bất đẳng thức Bu nhia côpxki ta có: 

(3x + 5y)² \(\le\) (3² + 5²) .(x² + y²) 

<=> 7² \(\le\) 34.(x² + y²) => x² + y² \(\ge\) 49/34

Dấu "=" xảy ra <=> 5x = 3y mà 3x + 5y = 7 => x = 21/34; y = 35/34

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

One of the hottest topics on the international development agenda is how to harness the power of International Monetary Fund for the benefit of developing countries. What is sometimes called "the death of distance", brought about by the Internet, allow professional services such as (31) _________ education and training to be provided easily and quickly to (32) _____ areas. Some of the gains can be seen in countries as diverse as India and Morocco, where innovations range from (33)______ government announcements to local craftsmen selling their wares to a (34)     _______ market. But already a huge and expanding digital divide is opening up between developed and developing nations. The major tasks facing world leaders at present is to supply everybody on the planet with clean water, basic education and the drugs needed to fight preventable diseases. Installing a modem in every classroom and linking us to (35) _______ _____  must be a lesser criteria at least.

Question 33

A. recorded

B. online

C. broadcast

D. programmed