Những ứng động nào dưới đây là ứng động không sinh trưởng?

A. Hoa mười giờ nở vào buổi sáng. Khí khổng đóng, mở

B. Hoa mười giờ nở vào buổi sáng. Hiện tượng thức ngủ của chồi cây bàng

C. Sự đóng, mở của lá cây trinh nữ. Khí khổng đóng mở

D. Lá cây họ đậu xoè ra và khép lại. Khí khổng đóng, mở

Phản ứng nào sau đây là phản ứng oxi hóa - khử?

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

(1) As the twentieth century began, the importance of formal education in the United States increased. The frontier had mostly disappeared and by 1910 most Americans lived in towns and cities. Industrialization and the bureaucratization of economic life combined with a new emphasis upon credentials and expertise to make schooling increasingly important for economic and social mobility. Increasingly, too, schools were viewed as the most important means of integrating immigrants into American society.

(2) The arrival of a great wave of southern and eastern European immigrants at the turn of the century coincided with and contributed to an enormous expansion of formal schooling. By 1920 schooling to age fourteen or beyond was compulsory in most states, and the school year was greatly lengthened. Kindergartens, vacation schools, extracurricular activities, and vocational education and counseling extended the influence of public schools over the lives of students, many of whom in the larger industrial cities were the children of immigrants. Classes for adult immigrants were sponsored by public schools, corporations, unions, churches, settlement houses, and other agencies.

(3) Reformers early in the twentieth century suggested that education programs should suit the needs of specific populations. Immigrant women were once such population. Schools tried to educate young women so they could occupy productive places in the urban industrial economy, and one place many educators considered appropriate for women was the home.

(4) Although looking after the house and family was familiar to immigrant women, American education gave homemaking a new definition. In preindustrial economies, homemaking had meant the production as well as the consumption of goods, and it commonly included income-producing activities both inside and outside the home, in the highly industrialized early-twentieth-century United States, however, overproduction rather than scarcity was becoming a problem. Thus, the ideal American homemaker was viewed as a consumer rather than a producer. Schools trained women to be consumer homemakers cooking, shopping, decorating, and caring for children "efficiently" in their own homes, or if economic necessity demanded, as employees in the homes of others. Subsequent reforms have made these notions seem quite out-of-date.  

Which paragraph mentions the importance of abilities and experience in formal schooling?

A. Paragraph 2

B. Paragraph 4

C. Paragraph 1

D. Paragraph 3

Đốt cháy hoàn toàn 15,2 gam hỗn hợp X gồm axit C_nH_2n+1COOH và rượu C_mH_2m+1OH (có số cacbon trong phân tử khác nhau) thu được 13,44 lít khí CO₂(đktc) và 14,4 gam H₂O. Thực hiện phản ứng este hóa 15,2 gam hỗn hợp X như trên với hiệu xuất 90% thu được x gam este. Tính x.

Read the following andmark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

Harvard University, today recognized as part of the top echelon of the world's universities, came from very inauspicious and humble beginning.

This oldest of American universities was founded in 1636, just sixteen years after the Pilgrims landed at Plymouth. Included in the Puritan emigrants to the Massachusetts colony during this period were more than 100 graduates of England's prestigious Oxford and Cambridge universities, and these universities graduates in the New Word were determined that their sons would have the same educational opportunities that they themselves had had. Because of this support in the colony for an institution of higher learning, the General

Court of Massachusetts appropriated 400 pounds for a college in October of 1636 and early the following year decided on a parcel of land for the school; this land was in an area called Newetowne, which was later renamed Cambridge after its English cousin and is the site of the present-day university.

When a young minister named John Harvard, who came from the neighboring town of Charlestowne, died from tuberculosis in 1638, he willed half of his estate of 1,700 pounds to the fledgling college. In spite of the fact that only half of the bequest was actually paid, the General Court named the college after the minister in appreciation for what he had done. The amount of the bequest may not have been large, particularly by today's standard, but it was more than the General Court had found it necessary to appropriate in order to open the college.

Henry Dunster was appointed the first president of Harvard in 1640, and it should be noted that in addition to serving as president, he was also the entire faculty, with an entering freshmen class of four students. Although the staff did expand somewhat, for the first century of its existence the entire teaching staff consisted of the president and three or four tutors.

The passage indicates that Harvard is _______________

A. one of the oldest universities in the world

B. the oldest university in the world

C. one of the oldest universities in America

D. the oldest university in America

Thế nào là hai phương trình tương đương?

Thụ thể tiếp nhận chất trung gian hóa học nằm ở

A. màng trước xináp

B. khe xináp

C. chùy xináp

D. màng sau xináp

Huyết áp cao nhất ở đâu trong hệ mạch?

A. Động mạch chủ.                                  

B. Mao mạch.

C. Tĩnh mạch chủ.                   

D. Động mạch chủ và tĩnh mạch chủ.

Ở một loài thực vật, khi tiến hành phép lai thuận nghịch, người ta thu được kết quả như sau: Phép lai thuận: Lấy hạt phấn của cây hoa đỏ thụ phấn cho cây hoa trắng, thu được F₁ toàn cây hoa trắng. Phép lai nghịch: Lấy hạt phấn của cây hoa trắng thụ phấn cho cây hoa đỏ, thu được F₁ toàn cây hoa đỏ. Lấy hạt phấn của cây F₁ ở phép lai thuận thụ phấn cho cây F₁ ở phép lai nghịch thu được F₂. Theo lí thuyết, F₂ có:

A. 75% cây hoa đỏ, 25% cây hoa trắng

B. 100% cây hoa trắng.

C. 100% cây hoa đỏ

D. 75% cây hoa trắng, 25% cây hoa đỏ.

Cho các chất X, Y, Z, T đơn chức, mạch hở có cùng công thức phân tử là C₄H₆O₂ và có đặc điểm sau:

– X có mạch cacbon phân nhánh và dung dịch X làm đổi màu quì tím.

– Y có phản ứng tráng bạc, thủy phân Y trong NaOH thu được ancol không no

– Thủy phân Z cho 2 chất hữu cơ có cùng số nguyên tử cacbon

– T không có phản ứng tráng bạc và không tham gia phản ứng với dung dịch NaHCO₃.

Xác định công thức cấu tạo của các chất X, Y, Z, T