Hỗn hợp khí X gồm etylamin và 2 hiđrocacbon là đồng đẳng liên tiếp. Đốt cháy hoàn toàn 100 ml hỗn hợp X bằng một lượng oxi vừa đủ, thu được 550 ml hỗn hợp Y gồm khí và hơi nước. Nếu cho Y đi qua dung dịch  H 2 SO 4 đặc (dư) thì còn lại 250 ml khí. CTPT của 2 Hiđrocacbon là:

A.  CH 4 ,   C 2 H 6

B.  C 2 H 4 ,   C 3 H 6

C.  C 2 H 6 ,   C 3 H 8

D.  C 3 H 6 ,   C 4 H 8

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

In times of war, the Red Cross is dedicated to reducing the sufferings of wounded soldiers, civilians, and prisoners of war.

A. mounted

B. excited

C. devoted

D. interested

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.

They couldn’t climb up mountain because of the storm.

A. The storm made it not capable of climbing up the mountain.

B. Their climbing up the mountain was unable due to the storm.

C. The storm made them impossible to climb up the mountain.

D. The storm discouraged them from climbing up the mountain.