Ghe vay sao? =)))

33-Thành-9D x và y là vận tốc, đề bài cho thời gian gặp nhau là 2 giờ suy ra mỗi xe đi trong 2 giờ.

Quãng đường = vận tốc . thời gian

Tổng quãng đường AB = quãng đường người A + quãng đường người B đi = 2x+2y=48

 =)))))

Được hơn một năm rồi ông nội =)))

III. Give the correct form of the words in brackets:

1. The ..... system of the body is made up of our bones. It supports our body and protects our organs ( skeleton )

2. Food is broken by the ..................... system and turned into energy ( digest )

3. Acupunture is one of the oldest ..................... treatments in the world ( medicine )

4. The recipe for this dish .................. in Japan a long time ago ( origin )

5. The practice of acupunture involves placing hair-thin needles in ................ pressure points throughout the body ( vary )

6.                        , there were 365 acupoints, but this has increased to more than 2000 nowadays ( origin )

7. People who are taking blood related medicine should not have the .............. ( treat )

VI.Closest meaning

1. Acupuncture originated in China and has been used as a traditional medicine for thousands of years.

            A. began                      B. created                    C. developed               D. introduced

2. There is no evidence at this time that acupuncture can treat cancer itself.

            A. clue                         B. data                         C. proof                       D. sign

3. Acupuncture can treat from simple to complicated ailments.

            A. acupoints                 B. diseases                   C. points                      D. treatments

4. Some people believe that acupuncture can be a cure of cancer.

            A. allergy                     B. practice                    C. therapy                    D. hygiene

5. Acupuncture can ease nausea and vomiting caused by chemotherapy.

            A. increase                   B. prevent                    C. reduce                     D. spoil

6. Are there any alternatives that might provide better options for gay people?

            A. choices                    B. decisions                 C. judgements              D. votes

7. The old blood cells are broken down by the spleen and eliminated from the body.

            A. cut out                     B. exhaled                    C. removed                  D. held

The Central Nervous System

The adult brain weighs about three pounds. This doesn’t seem like much, but it is one of the most important organs in the human body. The brain is made up of millions of nerve cells. These nerve cells tell the rest of the body what to do. Without a brain, we could not live. The spinal chord is connected to the brain. It runs from our neck down through our back. The spinal chord and the brain make up what is called the central nervous system. The brain is like the body’s computer. It controls body temperature and reminds us to breathe. The brain allows the body to have voluntary movement, thought, language, and reasoning. Different parts of the brain have different jobs. The brain tells us when we are hungry and thirsty. It also is responsible for memory and emotion. Our brain relies on food to give it energy. You need to eat healthy foods to keep your brain and the rest of your body working right. Healthy foods like fruits, vegetables, cereals, grains, milk, and other dairy products are all important foods for us to eat. We also need to keep our brains active. Research has shown that the less active our brain is, the less we are able to remember and do. So keep thinking, moving, and doing. It’s great for your brain.

1. After reading the passage, what do you think would happen if your brain was injured?

A. It would immediately double in size.                      B. Our bodies might not be able to perform certain things.

C. The heart would begin to take over the body.   D. Doctors have not yet determined what happens in this case.

2. The main idea of this passage is ________.

A. to inform the reader about what happens when they are thinking

B. to inform the reader about the connection between the heart and brain

C. to inform the reader about how important healthy food is to the brain

D. to share general information about the brain and the spinal chord and how they work

3. The word "relies" in line 8 can be replaced by _______?

A. depends       B. requires                    C. moves                      D. works

4. The word "it" in line 1 refers to ________.A. brain     B. this              C. organ                       D. body

5. Which of the following statement is false?

A. Our brain needs to be fed.                             B. Inactivity is not good for our brain.

C. The whole brain has one function.                 D. The brain is a very important part of our body.

II. Multiple choice:

1.       The ..............system of the body lets us break down the food we eat and turns it into energy.

A. respiratory                     B. digestive                  C. circulatory               D. skeletal

2.       Therapies like acupuncture are believed to be effective..........to modern medicine.

A. devices                          B. precautions              C. capabilities              D. alternatives

3.       Daily exercise and weight control strongly influence your chances of staying.............

A. passive                          B. healthy                    C. active                       D. lazy

4.       The row of bones down the middle of a human's back is called the.......... 

A.brain                               B. skull                         C. skeleton                    D. spine

5.       Playing sports will............a lot of your energy.        

A. spend                            B. comsume                 C. have            D. waste

6.       To attend the concert, you need to book a .......... in advance.     

A. ticket                              B. fare                          C. fine                          D. place

7.       Mary has grown up and turned...........a beautiful girl.           

A. up                                  B. down                       C. into                           D. in

8.       Using acupuncture, doctors must know all.............. points.   

A. soreness                         B. pressure                    C. massage        D. section

9.       In under a minute, your ____ can pump blood to bring oxygen and nutrients to every cell in your body.

A. brain                        B. heart            C. lungs                        D. vessels

10.   The human ____ system is a series of organs responsible for taking in oxygen and expelling carbon dioxide.

A. circulatory               B. digestive                  C. nervous                   D. respiratory

Bài 10: Một  hợp chất được tạo thành từ các ion M⁺ và X₂^2-. Trong phân tử M₂X₂ có tổng số hạt cơ bản là 164 trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 52. Số khối của M lớn hơn số khối của X là 23. Tổng số hạt cơ bản trong ion M⁺ lớn hơn trong ion X₂^2- là 7 hạt. Xác định CTPT M₂X₂