Những loại máy móc, dụng cụ nào sau đây sử dụng nguyên lí của các máy cơ đơn giản:

A. Cầu bập bênh

B. Xe gắn máy

C. Xe đạp

D. Máy bơm nước

a)43+(-11)=317-x-317

32=-x=>-32=x

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

  Most educational specialists believe that early schooling should provide children with an (27)_____ of their own abilities and the self-confidence to use their abilities. One approach recognised by many (28)______ as promoting these qualities is the Montessori method, first practised by Maria Montessori of Italy in the early 1900s. Nancy McCormick Rambusch is credited with (29) ______ the method in the United States, where today there are over 400 Montessori schools.

   The method helps children learn for themselves by (30) ______ them with instructional materials and tasks that facilitate acts of discovery and manipulation. Through such exploration, children develop their sense of touch and learn (31)______ to do everyday tasks without adult assistance. Other benefits include improvement in language skills, and acquaintance with elements of science, music, and art.

Question 31:

A. how

B. what

C. that

D. which