---Why do you look so sad?---There are so man...

---Why do you look so sad?

---There are so many problems_______.

A. remaining to settle　　　　　　　　　 B. remained settling

C. remaining to be settled　　　　　　　 D. remained to be settled

高二英语单项填空中等难度题查看答案及解析

--- Why do you look sad?

---There are so many problems ______.

高二英语单项填空简单题查看答案及解析

---Why do you look so upset?

---There are so many troublesome problems ____.

高二英语单项填空困难题查看答案及解析

---Why do you look so upset?

---There are so many troublesome problems _____.

A．remaining to be settled                   B．remained settled

C．remaining to settle                      D．remained to be settled

高二英语单项填空困难题查看答案及解析

Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.

Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.

Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.

The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.

Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.

高二英语其他题中等难度题查看答案及解析

Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.

Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.

Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.

The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.

Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.

高二英语阅读理解中等难度题查看答案及解析

－Why are you looking so worried? Is there anything I can do for you?

－The computer ________ break down when I nearly finished my composition.

A．can              B．should            C．must             D．dare

高二英语单项填空中等难度题查看答案及解析

—Hi, Lydia. Are you going to the concert on Friday?

—I’d like to. But there are so many problems_______.

A. remaining to be settled         B. remained settling

C. remaining to settle            D. remained to be settled

高二英语单项填空中等难度题查看答案及解析

There are many events you can do in our city. Now have a look at them.

Mindfulness Meditation（冥想）: Learn how just five minutes a day of meditation can benefit emotional, mental and physical health. The Hernando County Public Library System will host this seminar, which introduces some meditation techniques. Presented by Diana Reed of Gaya Jyoti Yoga. 1:30 pm to 2:30 pm. Free. S. T. Foggia Branch Library, 6335 Blackbird Ave, Spring Hill.（352）754-4043.

Book Discussion Group: Each month, the group discusses a new book. The group is designed for adults. This month’s book is The End of Your Life Book Club by Will Schwalbe. Contact the library for a copy of the book and discussion questions. 1:45 pm to 3: 15 pm. Free. Harold G. Zopp Memorial Library, 9220 Spring Hill Drive, Spring Hill.（352）754¬4043.

What to Do When Your Landscape Sleeps: Seminar participants will learn how to care for a landscape during the cool season and prepare it for spring and summer. 10: 30 am. Free. Harold G. Zopp Memorial Library, 9220 Spring Hill Drive, Spring Hill.（352）540-6230.

Writers Workshop: The group meets every other Thursday. All levels of experience from beginners to published authors are welcome. Bring pen and paper. 1 pm to 3 pm. Free. East Hernando Branch Library, 6457 Windmere Road, Ridge Manor West.（352）754-4043.

Low-cost Pet Vaccination（预防接种）Clinic: Sponsored by the Florida International Teaching Zoo veterinary（兽医）staff. Vaccinations are administered by a veterinarian. 6: 30 pm to 7: 30 pm. Rabies vaccinations for dogs and cats are $ 7. Tractor Supply Go. , 18471 Cortez Blvd, Brooksville. (352) 867-7788.

1.What is required to do in Book Discussion Group?

A. Buy a new book every month.

B. Read a book for the discussion.

C. Borrow a book from other members.

D. Gather for two hours for the discussion.

2.How is the fifth activity different from the others?

A. It is paid.

B. It is interesting.

C. It costs more time.

D. It is held in the afternoon.

3.Which activity requires its members to gather twice a month?

A. Mindfulness Meditation.

B. Book Discussion Group.

C. Writers Workshop.

D. Low-cost Pet Vaccination Clinic.

高二英语阅读理解中等难度题查看答案及解析

There are so many things we do in our daily lives that have become a "habit".1.How you answer the phone is a habit. The way you sit in the car when you drive is a habit. Have you ever tried to change the way you do something, after you ve done it in a certain way for so long? It's not very easy to do. The minute your mind drifts to something else, you go right back to the old way of doing things.2.it's a way of doing things that has become routine or commonplace. To change an existing habit or form a new one can be a boring task.

Let's pick something fairly easy to start with, like spending 15 minutes in the morning reading a book. If you want to turn something into a habit that you do every day, you have to WANT to do it.3.Make a firm decision to do this on a daily basis.

Imprint it in your mind. Write several notes to yourself and put them in places where you will see them. By the alarm clock, on the bathroom mirror, on the refrigerator door, in your briefcase, and under your car keys are good places to start.

After the newness wears off, then you will have to remind yourself, "Hey, I forgot to..." Keep using the notes if you have to.4.Some people say it will take over a month to solidify it and make it something you will do without having to think about it. I tend to agree with the last statement. Two to three weeks will help you to remember, but thirty days or more will make it a part of your everyday routine.5.

A. What is a "habit" anyway?

B. Forming a bad habit is easy.

C. Brushing your teeth is a habit.

D. Is doing things in an old way good?

E. If you don't, you will find a way to do everything but that.

F. It takes 16 to 21 times of repeating a task to make it a habit.

G. that's something you won't necessarily have to think about before you do it—habit.

高二英语七选五中等难度题查看答案及解析