Scientists say that banana trees may disappea...

Scientists say that banana trees may disappear(消失) from the world 　　　 banana cancer.

A. because of　　　　 B. instead of　　　　　　 C. as for　　　　　　　　 D. together with

九年级英语单项填空简单题查看答案及解析

Scientists say that banana trees may disappear(消失) from the world _______ banana cancer.

A. because of　　 B. instead of　　 C. as for　　 D. together with

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You'd better eat a banana while you still can. British scientists say that the fruit may disappear by 2050.

One ______ is climate change. Scientists from the UK collected data(数据) from 27 countries and regions that produced 86 percent of the world's bananas. They found that climate change has improved growing conditions in 21 of these countries and regions. _______ ,if temperatures keep rising, this advantage will disappear. The perfect temperatures range for growing bananas is between 24℃and 32℃. If temperatures get too high, they will _____ growing.

Diseases are another danger to bananas. Unlike other crops, the bananas come from shoot cuttings rather than seeds. It means that all bananas plants have the _______ genotype(基因型). If a disease is able to kill one plant, it could kill them all.

One serious disease is called Panama Disease. Caused by a fungus(真菌) in the soil, it can easily ______ If one banana plantation suffers from the disease, it will take 30 years before it can grow bananas again. Scientists have yet to find a cure to fight Panama Disease.

1.A.reason B.example C.advantage

2.A.Besides B.Suddenly C.However

3.A.start B.keep C.stop

4.A.same B.strong C.simple

5.A.disappear B.spread C.change

九年级英语完型填空中等难度题查看答案及解析

People rarely thought of planting more trees to prevent the land from disappearing，_______？

A.didn't they B.did they C.do they D.don't they

九年级英语单选题中等难度题查看答案及解析

The little monkey 　　　　 a way to get the bananas from the tree.

A. came out　　　　 B. caught up with    C. came up    　　 D. came up with

九年级英语单项填空中等难度题查看答案及解析

Bananas don’t grow on trees. They grow on a stalk that looks just a little like a stalk of corn. The stalk is soft enough to be cut with a knife.

It takes about a year before bananas are ready to be picked. Some are as small as fingers. Others are as long as men’s arms. Some banana plants grow as tall as a house – even taller!

Not all bananas are eaten as fruit. Some never get sweet, and they are cooked as a kind of vegetable.

People in most countries never see a banana until it reaches the store. But if you visited a country where it’s hot and rains a lot all the year, you might see a banana plantation, a large farm where bananas grow.

The tasty fruit doesn’t come from a seed but from a root planted deep in the ground. First a stalk pushes up into the air. The leaves grow. In the beginning the banana plant grows very fast – sometimes as much as the length of your feet in one night. Soon, sweet-smelling flowers come out, and when their flowers drop off, bananas begin to grow.

As they get bigger, bananas start turning up. It looks as if they’re growing upside down! Bananas are ready to eat when they turn soft and yellow. Bananas are picked long before this – when they’re hard and green. This is because bananas have to travel many miles before they arrive at a store. On trucks and boats and trains bananas travel all over the world. There are special boats just for bananas and special trains that keep them just cool enough so that they will get ripe while traveling. If bananas are picked when they are ripe (成熟的), they will spoil on the way.

1.What’s the weather like in places where bananas grow?

A. Dry and cold　　 B. Cold and wet　　　　 C. Wet and hot　　　 D. Hot and dry

2.The fruit of banana plants come from________.

A. a stalk　　　　　 B. a tree　　　　　　　 C. a seed　　　　　　　 D.　 a root

3.Bananas are picked long before they are _____________.

A. green　　　　　　 B. ripe　　　　　　　 C. hard　　　　　　　　 D.red

4.Which of the following is NOT true according to the passage?

A. All bananas are eaten as fruit.

B. Some banana plants grow taller than a house.

C. Bananas get ripe on their way to the store.

D. It takes about a year before bananas are ready to be picked.

九年级英语阅读理解困难题查看答案及解析

Scientists have no ideas about how the trees communicate with each other.

A. learn from　　 B. get things from　　 C. send messages to

九年级英语单项填空中等难度题查看答案及解析

Scientists have long believed one way to stop the Earth’s air from warming is by planting more trees. The idea is that more trees will take in or absorb(吸收) some of the CO2 in the air. CO2 is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s air, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing CO2 as thought.

The first study was done at Duke University in Durham, North Carolina. Researchers pumped(打气) extra CO2 into a test area where green trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients(营养素), such as nitrogen(氮).

In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil(泥土) around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was let into the air as CO2.

The findings of the two studies were published last month in Nature magazine. They suggest there is limited(有限的) value in planting trees to reduce the CO2 pollution in the air.

Forest planting has been a part of negotiations(谈判) on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists(积极分子) had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates(估计) on the ability of forests to absorb CO2 were overly hopeful.

Some other scientists say the research provides some of the first evidence on how trees react(反应) to CO2. Some other scientists say the research disputes(质疑) a belief among some coal and power companies. The companies say that more CO2 in the air will not create harmful global warming. Instead, they say it will increase forests and other plants.

1.Why did the researchers put trees in extra CO2 in the first study?

A. To learn whether trees can still absorb CO2 under extreme conditions.

B. To get more oxygen from these trees.

C. To know how much CO2 that trees can absorb.

D. To see the effect of CO2 on the growth rate of these trees.

2.What happened to the leaves falling from the trees in the second study?

A. They broke down and the main parts turned into oxygen.

B. They broke down and the carbon had mainly turned into CO2.

C. They broke down and the carbon was mainly absorbed in the soil.

D. They absorbed more CO2.

3.Scientist Ram Oren thinks that common beliefs of the tree’s ability to absorb CO2 are __________.

A. just right　　 　　　　 B. not acceptable

C. a bit too cheerful　 D. too dangerous

九年级英语阅读理解中等难度题查看答案及解析

People drink alcohol(酒) in many parts of the world. Some medical scientists say light drinking may even be good for your health, especially for the heart. But they say such health benefits(好处) should be compared to the many health risks connected with alcohol use.

Some research suggests that having one to two drinks of alcohol a day may be good for your health. Several large studies have shown that this type of drinking may lower the risk of heart disease and other diseases.

A study last year suggested that drinking a little red wine may help lower the risk of breast cancer(乳腺癌) in women. Researchers at Medical Center in California studied 36 women. Each woman drank a glass of red or white wine every day for almost a month. Researchers collected blood samples(样本) from the women two times a month to test their hormone(激素) levels. The next month these women were told to exchange their wine. The researchers found that the women who drank red wine had lower levels of the female hormone than the white wine drinkers. They said red grapes have chemicals that may help to lower the risk of breast cancer.

However, recent studies suggested that even a little alcohol may generally increase the risk of breast cancer in women. They found that women who drink four small glasses of wine a week increase their risk of breast cancer by 15 percent.

Many studies have examined the harmful effects of alcohol use on the body. Alicia Ann Kowalchuk serves as medical director, saying “Healthy use for adults --- that's men under age 65 --- is no more than 4 drinks in a day and no more than 14 drinks in a week. And for women of all ages, it's no more than 7 drinks in a week and no more than 2 drinks in a day.” She says too much alcohol use has something to do with liver (肝脏) diseases, and many other cancers.

1.How did the researchers carry out their study?

A. By following an example.　　 B. By listing facts.

C. By collecting information worldwide.　　 D. By comparing tested objects.

2.Which of the following shows the structure of the passage?

A. 　　 B. 　　 C. 　　 D.

3.What is the best title of this passage?

A. Alcohol drinking may do harm to your health

B. Alcohol drinking can be both good and bad for you

C. Drinking alcohol is popular in many parts of the world

D. Drinking alcohol a day may give your health some benefits.

九年级英语阅读单选困难题查看答案及解析

Scientists say it may be a few years ______it is possible to test the new medicine on

patients.

A. because　　 B. after

C. since　　 D. before

九年级英语单选题中等难度题查看答案及解析