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【简答题】
A desert is a very dry land where there is hardly any rain. In the day, it can be so hot that you could fry an egg on the ground. But during the night it is sometimes so could that water would turn into ice. Many desserts are covered in sand. But some have mountains, rocks, or lakes that have dried up in the heat. The Great American Dessert has cliffs(悬崖) that have been made into amazing and beautiful shapes by the wind. The Sahara Desert in Africa is mostly sand. The Australian Desert has red sand. Sometimes it does not rain for a whole year in the desert. But there is water deep under the ground and some plants have roots that go very deep to find it. Other plants have roots that spread out(延伸) a long way so they can suck up the rain as soon as it falls. One desert plant is the cactus, which has long, spreading roots. The cactus stores water inside its hard skin. This skin protects it from heat and cold. Camels are a bit like cactus plants! They store water too—inside their bodies. They have special fur which protects them from the sun during the day and keeps them warm at night. Some other animals live in deserts, too. They have to be very good at seeing and hearing because most of them only come out at night. This is why many desert animals have extra big eyes or ears. A desert fox has bigger ears than a normal for. A gerbil has huge eye, so that it can see at night. It stays cool in the day by staying underground, like most desert animals. Some people live in the desert but they always make their homes near an oasis. An oasis is where water comes from an underground river. Near an oasis, people can grow lots of plants and keep animals. Life is hard in the desert, for people, animals and plants. But desert people like to live there. 小题1:A desert is very dry because__________. A.it is sandy B.there is so little rain C.the wind is strong D.there is no water deep under the ground 小题2:What does the underlined phrase' suck up 'in paragraph 3 mean_________? A.围堵 B.讨好 C.释放 D.吸收 小题3:Some desert animals have extra big eyes or ears because__________. A.the sunlight is too strong in the day B.they need to see and hear well at night C.it is very cold at nigh D.they store water in them. 小题4:Most desert animals stay cool in the day by_________. A.storing water in side their bodies B.drinking water as much as they can C.staying underground D.growing lots of plants 小题5:Whi ch of the following is true? A.Desert people like to live in the desert though life is hard. B.People in the desert usually fry eggs on the ground. C.Camels have special fur to store water. D.All the deserts are covered in sand.
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【判断题】植物细胞具有渗透现象,是因为细胞壁具有半透膜的性质。( )
A.
正确
B.
错误
【单选题】下列选项中,哪组是植物细胞发生质壁分离的结构基础()①外界溶液浓度小于细胞液浓度②原生质层的伸缩性大于细胞壁的伸缩性③细胞膜、液泡膜和两层膜之间的细胞质形成原生质层,相当于一层半透膜④植物细胞膜具有一定的流动性
A.
②④
B.
①④
C.
②③
D.
③④
【单选题】一个成熟的植物细胞可以看成是一个渗透装置,是因为() ①细胞膜是选择透过性膜 ②细胞质具有一定浓度 ③原生质层类同于半透膜 ④细胞液具有一定浓度
A.
①②
B.
①④
C.
②③
D.
③④
【判断题】细胞质膜具有选择透性,控制细胞与外界环境的物质交换
A.
正确
B.
错误
【简答题】细胞质膜具有 透性。
【单选题】要实现动态编联,派生类中的虚函数()。
A.
返回的类型可以与虚函数的原型不同
B.
参数个数可以与虚函数的原型不同
C.
参数类型可以与虚函数的原型不同
D.
以上都不对
【判断题】植物细胞具有渗透现象,是因为细胞壁具半透性膜性质。
A.
正确
B.
错误
【单选题】细胞膜能够防止细胞外物质自由进入细胞,保证细胞内环境的相对稳定。这是因为()。
A.
细胞膜具有流动性
B.
细胞膜具有选择透过性
C.
细胞膜主要由氨基酸构成
D.
细胞膜具有维持细胞形状的功能
【单选题】不同细胞器膜具有不同膜转运蛋白和不同的通透性,下列哪种细胞器膜可允许蔗糖、乳酸等小分子物质自由通过及一定条件下将大分子物质从细胞质穿膜运入,经酶分解后,产物再被转运回细胞质
A.
内质网膜
B.
高尔基复合体膜
C.
溶酶体膜
D.
核膜
E.
过氧化物酶体膜
【单选题】要实现动态联编,派生类中的虚函数( )
A.
返回的类型可以与虚函数的原型不同
B.
参数个数可以与虚函数的原型不同
C.
参数类型可以与虚函数的原型不同
D.
以上都不对
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