蛇麻腺

一笔债券质押式回购交易涉及（）。

A.一个交易主体、两次交易契约行为

B.两个交易主体、两次交易契约行为

C.一个交易主体、一次交易契约行为

D.两个交易主体、一次交易契约行为

2011年3月，日本近海强震引发的海啸，造成福岛核电站发生核泄漏事件，导致环境出现碘131超标，碘131原子的核电荷数为53，相对原子质量为131，碘原子的核外电子数为（　　）

A．131

B．127

C．78

D．53

现在，我们把无污染、无公害的食品叫做绿色食品．而最初，专家把绿色植物通过光合作用转化的食品叫做绿色食品，海洋提供的食品叫做蓝色食品，通过微生物发酵制得的食品叫做白色食品．根据最初的说法，下列属于绿色食品的是（　　）

A．大米

B．海带

C．食醋

D．食盐

You may be fascinated with pictures of animals in the wild. You might have imagined yourself taking pictures of animals that are rarely seen in the city. If you do get that chance, you may want to consider the following tips or rules.

First of all, a lot of professional photographers give respect to these animals and the environment they are in. Just remember that you should respect the animals and the environment in case these animals bite or hurt you.

Keep in mind that you are taking pictures of real, live, wild animals. A wild animal may bite to protect itself. You must be sensitive while taking their pictures and be gentle in all your movements. Do not feed the animals, or interact with animals that are sleeping or caring for their young.

If you are going to a place where it is privately(私人)owned, you’d better get the owner’s permission first before you start taking pictures.

Change the flash of your camera to natural light, so the animals will not be frightened or surprised when you start shooting. Animals do not react well when they are surprised.

Be very patient. Make sure you are aware of the changes in behavior of the animal and its moods. Be familiar with the animals’ natural habitat.

Now if those rules are clear, it is time for planning. Consider the weather; some animals do not go out when it is raining while some animals love the rain. Therefore, a little research on the weather will not hurt. You should consider taking pictures after sunrise and before sunset. Now if the animal is nocturnal(夜间活动的), then you should prepare to battle not only the wild but also the darkness.

An adventure in the wild will make you very excited. However, you should be well equipped, have experts to back you up, and also a permit for doing the photo shoot. If you do not have any of these, then maybe you should consider visiting the zoo instead.

小题1:The main purpose of the author in writing this passage is　　　.

A．to call for us to protect animals

B．to show where to buy pictures of animals

C．to explain how to get along with wild animals

D．to give us tips on taking pictures of animals in the wild小题2:Which of the following aspects is NOT mentioned in the passage?

A．Respecting the animals.

B．Making gentle movements.

C．Making the animals happy.

D．Changing the flash of your camera to natural light.小题3: If the animals are on a farm owned by a person, we should　　　.

A．ask the owner to take pictures for us

B．ask for the owner’s permission first

C．make sure the owner is present when we take pictures

D．take pictures when the owner is feeding animals小题4: We can infer from the passage that　　　.

A．most animals love being taken pictures of

B．we have to finish the pictures before sunset

C．we’d better take pictures when the animals are sleeping

D．we should pay attention to the animals’ moods when taking pictures小题5:What preparation should you do before going to take pictures of wild animals?

①Preparing some food to feed the animals.

②Asking experts for advice.

③Knowing the weather in the animals’ habitat.

④Getting a permission for taking pictures of wild animals.

A．①②④

B．②③④

C．①②③

D．①③④

水轮发电机电气方面不平衡力主要有哪些？