Their performance will be ________ in the open air. Can you help me to ________ the notice on the wall?

1. A.
   put on; put on
2. B.
   put up; put up
3. C.
   put up; put on
4. D.
   put on; put up

单词拼写（共15小题；每小题1分，满分15分）
根据括号内的汉语提示完成句子。
【小题1】On the evening of Mid-Autumn Festival, I usually sit in the open air with my family,      (欣赏)the full moon.
【小题2】I used to live in a beautiful house       (包围)by many kinds of trees.
【小题3】There is a big underground railway      (系统)in London.
【小题4】Eating       (胡萝卜)can help you see better.
【小题5】We know that Canada’s population is only     (稍微)over thirty million.
【小题6】It is important to know your own      (长处)and weaknesses.
【小题7】Each       (宗教)activity has it’s own belief.
【小题8】Dinosaurs laid eggs and       (存在)on the earth for morn than 140 million years.
【小题9】He wandered around Tibet for a month. His experience is      (难以置信).
【小题10】We visited the in our ________(宇宙飞船) many years ago.
【小题11】On his________(到达)he went straight to the counter and spoke to the clerk.
【小题12】She usually_____(结合)creative imagination with intelligence to create some wonders.
【小题13】A saying goes，“A friend  in need is a friend ____(真正地，确实)．”
【小题14】It’s bad______(礼貌)to talk with your mouth full.
【小题15】With trembling hands Mr. Jackson opened the ___  (信封) and read the letter.

All plant cells are capable of taking up water. Even dead ones do to a certain degree. Absorption（吸收）of water by dead cell walls makes wood become larger. In common land plants, the living cells of roots take up most of the water. Land plants without roots do exist, however. Those greenish-yellow lichens（苔藓）you see on rocks in the high mountains have no roots. Half a billion years ago, when water plants started to enter the land, the first land plants did not have roots.

Even among the flowering plants, one finds rootless forms. These flowering plants are “the higher plants” because they evolved（进化）recently and are thus considered higher on the evolutionary scale（进化度）. In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because where the plant grows, it never rains. The plant gets its water only from the dew（露水）it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and so prevents dew from forming, and the plant dies. In the southern United States and in Puerto Rico, one sees bromeliads growing high above the streets on the insulation（绝缘物）of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves.

1．Wood becomes larger because of    .

A．dead cell walls                                           B．water entering dead cells

C．the growth of cells                                   D．the death of cells

2．The “bromeliad” is a plant that   .

A．has useless roots                                      B．is a pineapple

C．can grow anywhere                                 D．takes up water through its leaves

3．The most suitable title for this passage is “    ”.

A．Absorption of water by plants                     B．Rootless plants

C．Plants in the desert                                        D．Higher plants

There are some very good things about open education. This way of teaching allows the students to develop their own interests in many subjects. Open education allows students to be responsible for their own education. Some students do badly in traditional classrooms. The open classroom may allow them to enjoy learning. Some students will be happier in an open education school. They will not have to worry about grades or rules.

But many students will not do well in an open classroom. For some students, there are too few rules. These students will do little in school. They will not make good use of open education. Because open education is so different from traditional education, these students may have a problem of getting used to making so many choices. For many students it is important to have some rules in the classroom. They worry about the rules even when there are no rules. Even a few rules will help this kind of students. The last point about open education is that some traditional teachers do not like it. Many teachers do not believe in open education. Teachers who want to have an open classroom may have many problems at their school.

You now know what open education is. Some of its good points and bad points have been explained. You may have your own opinion about open education. The writer thinks that open education is a good idea, but only in theory. In actual fact, it may not work very well in a real class or school. The writer believes that most students, but of course not all students, want some structure in their classes. They want and need to have some rules. In some cases, they must be made to study some subjects. Many students are pleased to find subjects they have to study interesting. They would not study those subjects if they did not have to.

Title: Open Education

How would you like to sleep with one half your brain asleep and the other half awake? Dolphins sleep this way. Recently, scientists at Indiana State University have discovered that ducks sleep this way too. They found that ducks sleep half awake so they can rest and watch for danger at the same time.

After putting their ducks in a row and videotaping them, some researchers found ducks on the end of each row spent more time asleep with one eye open, apparently looking for predators.

“The more the ducks felt threatened, the more they slept with one eye open,” said lead author Niels C. Rattenborg, a graduate student at Indiana State University, Terre Haute. “The unique aspect is not that they do it, but that they control it. When they sleep at the edge of a group, they tend to realize greater danger, so they spend more time sleeping with one half of their brain.” Ducks with one eye open were still awake enough to detect predators, said the authors of the study, which appears today in the journal Nature.

The researchers studied four groups of four ducks held in plastic boxes, which were arranged in a row. Ducks on the end were found to sleep with one eye open 31.8 per cent of the time, compared to 12.4 percent of the time for ducks in the central position.

Also, ducks in the central position did not open one eye more than the others, while ducks on each end kept the eye facing away from the group open 86.2 per cent of the time. Brain wave readings of the ducks showed that the half of the brain receiving signals from the closed eye indicated that half of the brain was sleeping. Signals from the half of the brain receiving signals from the open eye showed a state between fully awake and asleep.

1.The under lined word “predator” is most likely to mean       .

A. an animal that is likely to be friends with ducks

B. a human being who looks after and feeds ducks

C. a scientist who does research work on animals

D. an animal that hunts, kills and eats other animals

2.Ducks at the end of each row sleep with one eye open because       .

A. they are looking for food

B. they are watching out for danger

C. they want to enjoy the scenery

D. they are unique in their sleeping habit

3.Which of the following is true according to the passage?

A. Ducks with one eye open at the edge can still enjoy a certain degree of sleep.

B. Ducks with less sense of duty usually choose to stay in the center of a row.

C. Ducks on the northern end of a row would keep their eye facing the south open.

D. A video tape recorder was the only electronic device used in the experiment.