Di sản văn hóa vật thể bao gồm?

A. Di tích lịch sử - văn hóa và tài nguyên thiên nhiên.

B. Danh lam thắng cảnh và tài nguyên thiên nhiên.

C. Tài nguyên thiên nhiên và môi trường.

D. Di tích lịch sử - văn hóa và danh lam thắng cảnh.

Vì sao nói: Tây Âu là một trong 3 trung tâm kinh tế - tài chính lớn nhất thế giới nửa sau thế kỉ XX

Thực hiện các thí nghiệm sau:

(a) Cho dung dịch HCl vào dung dịch Fe(NO₃)₂;  (b) Sục khí CO₂ vào dung dịch Ca(OH)₂;

(c) Cho Si vào dung dịch KOH;                   (d) Cho P₂O₅ tác dụng với H₂O;

(e) Đốt nóng dây Mg trong khí CO₂;           (g) Đốt cháy NH₃ trong không khí.

Trong các thí nghiệm trên, số thí nghiệm xảy ra phản ứng oxi hóa – khử là

A. 5.                            

B. 3.                         

C. 2.                          

D. 4.

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 23 to 27. Fill in the appropriate word in question 33

Taking piano lessons and solving math puzzles on a computer significantly improve specific math skills of elementary schoolchildren, according to a new study. The results, (23) _______ were published in the journal Neurological Research, are the latest in a series that links musical training to the development of higher brain functions.

Researchers worked with 135 second-grade students at a school in Los Angeles after (24) _______ a pilot study with 102 students. Children that were given four months of piano training as well as time playing (25) _______ newly designed computer software scored 27 percent higher on math and fraction tests than other children.

Piano instruction is thought to enhance the brain’s “hard wiring” for spatial-temporal reasoning, or the ability to visualize and transform objects in space and time, says Professor Gordon Shaw, who led the study. At the same time, the computer game allows children to solve geometric and math puzzles that boost their ability to (26) _______ shapes in their mind.

The findings are significant (27) _______ a grasp of proportional math and fractions is a prerequisite to math at higher levels, and children who do not master these areas of math cannot understand move advanced math that is critical to high-tech fields.

(Adapted from “Eye on Editing 2” by Joyce S. Cain)

A. because.

B. unless.

C. before.

D. although.