Ba quả cầu bằng kim loại A,B,C đặt trên 3 giá cách điện riêng rẽ. Tích điện dương cho quả cầu A. Trường hợp nào sau đây thì quả cầu B bị nhiễm điện dương, quả cầu C bị nhiễm điện âm.

A. Cho quả cầu B tiếp xúc với quả cầu C, rồi cho quả cầu A chạm vào quả cầu B, sau đó tách quả cầu A ra.

B. Cho quả cầu B tiếp xúc với quả cầu C , rồi đưa quả cầu A lại gần quả cầu B, sau đó tách quả cầu C ra khỏi quả cầu 

C. Cho quả cầu B tiếp xúc với quả cầu C, rồi đưa quả cầu A lại  gần quả cầu C, sau đó tách quả cầu C ra khỏi quả cầu B.

D. Không có Phương án nào khả thi vì quả cầu A ban đầu được tích điện dương.

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 33 to 42. Fill in the appropriate word in question 34

                TRAFFIC LIGHTS

The first traffic signal was invented by a railway signaling engineer. It was installed (33) ___ the Houses of Parliament in 1868. It (34)_____ like any railway signal of the time, and was operated by gas.  (35) ____, it exploded and killed a policeman, and the accident discouraged further development until cars became common.

(36) ____ traffic lights are an American invention. Red – green systems were installed in Cleveland in 1914. Three - color signals, operated (37) _____ hanz d from a tower in the (38) _____ of the street, were installed in New York in 1918. The first lights of this type to (39) ____ in Britain were in London, on the junction between St. James’s Street and Piccadilly, in 1925. Automatic signals were installed (40) ____ year later.

In the past, traffic lights were special. In New York, some lights had a statue on top. In Los Angeles the lights did not just change silently, but would ring bells to (41) _____ the sleeping motorists of the 1930s. These are gone and have been (42) ____ by standard models which are universally adopted.

A. resembled

B. looked

C. showed 

D. seemed

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions

Were it not for the money, this job wouldn’t be worthwhile

A. This job offers a poor salary

B. This job is rewarding at all

C. The only thing that makes this job worthwhile is the money

D. Although the salary is poor, the job is worthwhile

Polistiren không tham gia phản ứng nào trong các phản ứng sau?

A. Đepolime hóa

B. Tác dụng với C l 2 (có mặt bột Fe, đun nóng)

C. Tác dụng với C l 2 (chiếu sáng)

D. Tác dụng với NaOH (dung dịch)