下列不属于陆生动物主要特征的是() A.一般有防止水分散失的结构 B.绝大多数用

题型:选择题

问题:

下列不属于陆生动物主要特征的是( )

A.一般有防止水分散失的结构

B.绝大多数用气管或肺呼吸

C.用体壁呼吸

D.一般具有发达的感觉器官和神经系统

考点:观察实验:饲养和观察蚯蚓动物的生活环境和生活习性动物的形态结构和功能
题型:选择题

Information is received into our brain by attention, and its quality determines (决定) how well it will be processed, saved and used afterwards.

All information we receive is chosen by our attention. Factors (因素) affecting (影响) our attention are personal interest, experience, ability, feelings, knowledge, environment, timing, and so on. The same information may attract different forms and levels of attention from different people. Some people can get and save the information easily; some may have great difficulty; while others may just turn a blind eye to it. To the same information, one may even pay different levels of attention at different times. But if the facts work together, the quality of attention may be better. Therefore, it is not surprising to see that somebody with average intelligence (智力) can have excellent performances in some fields.

The good news is that a person's attention can be shaped, trained and made stronger by effective exercise. With this in mind, we should keep improving the quality of our attention.

小题1:"it" in Paragraph 1 means _______.

A.information

B.brain

C.attention

D.quality小题2:All information we receive depends on _______.

A.information itself

B.our attention

C.our intelligence

D.the environment小题3:Which is not the factor that affects our attention according to the passage?

A.Interest and experience.

B.Experience and knowledge.

C.Ability and feelings.

D.Food and drinks.小题4:About attention, which of the following statements is right?

A.People always have the same level of attention.

B.People pay the same attention to the same information.

C.A person may pay different levels of attention to the same information at different times.

D.All factors affecting attention never work together.小题5:According to the passage, _______ can help people to make their attention better.

A.speaking more

B.effective exercise

C.hard work

D.high intelligence

题型:选择题

我能写出划线词语的近义词。

1.张衡是汉朝著名的天文学家。 

      著名 (      )

2.他看清楚了,北斗七星果然绕着北极星慢慢地转动。

      清楚 (      )

题型:选择题

设NA表示阿伏加德罗常数的值。下列叙述正确的是

A.标准状况下,11.2 L乙醇中含有的碳氢键数为2.5NA

B.常温常压下,28 g C2H4、CO的混合气体中含有碳原子的数目为1.5NA

C.常温下,20 L pH=12的Na2CO3溶液中含有的OH离子数为0.2NA

D.标准状况下,2.24 L Cl2与足量的NaOH溶液反应,转移的电子数目为0.2NA

题型:选择题

如图是一种水位自动报警器的原理图,有关该报警器工作情况的下列叙述,不正确的是

[ ]

A.该报警器红灯是报警灯,报警器工作时,必须依靠一般水的导电性,且水位必须到达A

B.该报警器的红、绿灯不会同时亮

C.当水位没有达到A时,电磁铁没有磁性,只有绿灯亮

D.当该报警器报警时,电磁铁的上端是N极

题型:选择题

大风浪中采取漂滞法的船舶,下列说法哪项不正确:()

A.用保持舵效的最小速度并将风浪放在船首2-3罗经点迎浪航行

B.船舶停止主机随风浪漂流

C.适合保向性差或衰老的船使用

D.可在船首抛出锚链或大缆使船首迎风浪

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