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Cho 200 ml dung dịch Ba(OH)₂ 0,1M vào 300 ml dung dịch NaHCO₃ 0,1M, thu được dung dịch X và kết tủa Y. Cho từ từ dung dịch HCl 0,25M vào X đến khi bắt đầu có khí thoát ra thì hết V ml. Biết các phản ứng đều xảy ra hoàn toàn. Giá trị của V là

A. 160.

B. 40.

C. 60.

D. 80.

* 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 31 to 35.

  For kids, water sports are adventurous and fun filled, but safety has to be given first (31) ________. All kids should compulsorily wear life jackets, (32)_________they know how to swim. All boats and rafts should also carry (33)__________ life jackets, whistles and lifebuoys. While playing water sports, kids need to be accompanied by an adult, preferably an attentive lifeguard, who must know how to swim. He should also know what to do during times of emergency and the ABCs of giving first (34)__________Water sports should always be carried out when the climate is pleasant. If the weather is sunny, do apply sun screen cream to protect the children from radiations.

  There are different kinds of water sports for children. Let's start with a simple water sport (35)_________boating, which is very much enjoyable. In most of the kids and youths camps you'll find boating and canoeing. If you want an adventurous water sport, then sailing has to be your first choice.

(Adaptedfrom: https://www.ezilon.eom/articles/articles/8063/l/Water-Sports-for-Kids)

   Điền vào số 33

A. many

B. more

C. extra

D. enough