Unless you have planted something, you won’t ...

Unless you have planted something, you won’t be able to know the pleasure of watching the thing you have planted ______.

A. growing　　　 B. grown　　 C. to grow　　　　　 D. to be grown

高二英语单项填空中等难度题查看答案及解析

Unless __________, she won’t go to any party.

A．inviting           B．having invited      C．invited            D．being invited

高二英语单项填空中等难度题查看答案及解析

You won’t be able to control everything your teens do when they drive, but you can teach them about the importance of vehicle safety.

Locking the door upon entering the vehicle.

Did your teens know they should lock the doors immediately upon entering the vehicle? 1.. Teach them to lock their doors, as this could guarantee their safety when they are pulling out of a dark parking lot or stopping at a red light.

Driving a safe vehicle

Your teens will buy their car one day. They probably don’t care what you consider to be a good color, or model, but you should teach them how to buy a safe car. Top safety features include electronic stability control, a rear view camera, side impact airbags, etc. 2..

Avoiding distractions

3.. So make sure they know that. Teenagers tend to think themselves unbeatable (无 以伦比的), but if you gently explain the risks of not focusing on the road, they may decide to quit this dangerous habit.

Staying calm

You need to show that you’re confident of your teens’ driving skills, even if your teens’ speeding up too fast or hitting the brakes too hard scares you. 4.. They will react much better to quiet comments than cold words.

5.

There’s something about being young and learning to drive that comes with a strong wish for speed. You might not be able to stop the occasional speeding ticket, but you can help them see the importance of following the rules and keeping themselves safe.

A. Respecting speed limits.

B. Presenting the traffic rules.

C. If your teens haven’t been taught this, then they probably won’t do so.

D. Instead of yelling and stressing out on such occasions, try your best to speak calmly.

E. Looking at phones or controlling the radio while driving could make your teens seriously injured or worse.

F. You want to keep your children safe, but you can’t always stop them from doing dangerous things.

G. These will help them better control the vehicle and offer protection in the event of an accident.

高二英语七选五中等难度题查看答案及解析

I’m hoping that John will let us have the car tonight; __________, I’m afraid we won’t be able to go out.

A. even if        　　　　　 B. if so

C. what if　　     　　　　 D. if not

高二英语单项填空中等难度题查看答案及解析

______ quickly, _______ you won’t be able to catch the train.

A. To get up; or                        B. Getting up; and

C. Get up; or                           D. If getting up; but

高二英语单项填空中等难度题查看答案及解析

______ quickly, _______ you won’t be able to catch the train.

A. To get up; or                        B. Getting up; and

C. Get up; or                           D. If getting up; but

高二英语单项填空简单题查看答案及解析

— I'm leaving tomorrow.

— Oh, what a pity! I won't be able to see you off. I __ a tele-conference the whole morning.

A. have        B. am having    C. will be having  D. will have had

高二英语单项填空困难题查看答案及解析

— I'm leaving tomorrow.

— Oh, what a pity! I won't be able to see you off. I ____ a tele-conference the whole morning.

A．have                                 B．am having

C．will be having                          D．will have had

高二英语单项填空中等难度题查看答案及解析

Taktak tabulaba?

You probably don’t know how to answer that question---unless you happen to be one of the about 430 people in the world who speak a language called Matukar Panau. Then you would know it means “What are we doing?” Matukar Panau is one of the world’s rarest languages. It is spoken in just two small coastal villages in Papua New Guinea.

Several years ago, David Harrison, a language expert didn’t know much about Matukar Panau either. No one had ever recorded or even studied its words and rules. With so few speakers, the language risked disappearing soon. It was endangered.

Harrison didn’t want that to happen to Matukar Panau. So in 2009, he set out for Papua New Guinea. His goal: use modern technology to help the remaining speakers preserve their native tongue.

But Matukar Panau is far from the only language facing loss. Studies suggest that by the end of this century, nearly half of the 7,000 languages now spoken worldwide could disappear. They’re in danger partly because the only people left speaking them are elderly adults, Harrison says. When those individuals die, their language will die with them. In addition, children may discard a native language and instead use more common global languages, such as Chinese, English or Spanish.

In the United States alone, 134 native American languages are endangered. Harrison says, “language hotspots” exist all over the world. These are places with endangered languages that haven’t been recorded. They include the state of Oklahoma, pockets of central and eastern Siberia, parts of northern Australia and communities in South America.

1.The purpose of using the question “Taktak tabulaba?” is to ________.

A.introduce a new foreign language

B.introduce the topic of the text

C.show the difficulty understanding Matukar Panau

D.stress the importance of Matukar Panau

2.The underline word “discard” in Paragraph 4 means _______.

A.get rid of B.pick up

C.hear of D.learn about

3.The last two paragraphs imply that endangered languages are _________.

A.dying quickly in Siberia

B.popular in some special places

C.becoming a worldwide problem

D.some native tongues

高二英语阅读理解中等难度题查看答案及解析

Have you ever wondered why the roots of the plants always know which way to grow—into the soil but not above it? Some British scientists have recently solved this mystery.

It turns out that roots have special hairs that tie them into the soil and help them grow their way past obstacles, a team at the John Inners Center in Norwich reports in the February 29 issue of Journal Science.

“The key is in the fuzzy(有绒毛的)coat of hairs on the roots of plants,” says professor Liam Dolan. “We have found a growth control system that enables these hairs to find their way and to become longer when their path is clear.”

Root hairs explore the soil in much the same way a person would feel their way in the dark. If they come across an obstacle, they make their way around until they can continue growing in an opening. In the meantime, the plant is held in place as the hairs grip(紧紧抓住)the soil.

The hairs are guided by a clever chemical trick. A protein(蛋白质) at the tip of the root hairs called RHD2 helps them to take calcium(钙) from the soil. Calcium makes the hairs grow, and produce more RHD2, and take more calcium.

But when an obstacle blocks the hair’s path, or the hair reaches the surface of the soil, the cycle is broken and growth starts in another direction.

This system gives plants the flexibility to explore a complex environment and to live in even the most unpromising soils, says Dolan.

In poor soils such as in parts of Australia and Africa, native plants have adapted by producing enormous numbers of root hairs. A better understanding of this adaptation will allow scientists to develop hairy rooted crops that can grow in unfriendly environments.

According to Dolan, “Research in the John Inners Center is taking a breeding approach to increase hair length in wheat but it will be some time before new cultivars(栽培变种) are developed.”

1.The passage is mainly about _______.

2.How does the circle work?

3.We can infer from the last paragraph that ________.

高二英语阅读理解困难题查看答案及解析