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Frogs are animals that can live both in water and on land. There are more than 5,000 kinds of frogs on the earth. The earliest known frogs lived about 190 million years ago and the frogs today still look the same. Here are some fun things that you might not know about frogs. Enjoy! The Biggest and the Smallest Frogs Some frogs can be very big. The biggest kind of frog is the Goliath Frog in West Africa. Its body can be nearly 30cm long, about the size of a large cat. The Gold Frog and the Poison Frog are the smallest frogs in the world. They are less than 1cm long. Though the Poison Frog is very small, it is not weak at all. It is dangerous. Any animal that eats it will die very soon. The Best Jumpers Frogs are very good at jumping. They developed jumping legs so that they would not be eaten by other large animals. Using their big strong legs, more frogs can jump over 20 times their own length. The Australian Rocket Frog can even jump over 2m, which is 50 times its body length (5.5 cm). That might be the reason why frogs are called the best jumpers on the earth. The Cryogenic Animal Some frogs like the Common Wood Frog have a special ability to live in very cold places. When the temperature goes down, they become ice frogs. 2/3of their body water freezes. Their hearts stop, and their breathing stops too. You may think they are dead, but in fact they are not. Maybe we humans can learn the way that the frogs do for medical purpose. 小题1:The earliest frogs lived about million years ago. A.20 B.30 C.50 D.190 小题2: can jump over 2m. A.The Goliath Frog B.The Common Wood Frog C.The Poison Frog D.The Australian Rocket Frog 小题3:What will happen to a Common Wood Frog at very low temperature? A.It will die very soon. B.It will be an ice frog. C.It will become dangerous. D.It will become very small.
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【单选题】39装配图中,相邻两个金属零件,画剖面线时应( )。
A.
倾斜方向相同且间隔相同
B.
倾斜方向相反
C.
采用粗实线
D.
采用虚线
【单选题】装配图中,相邻两个金属零件,画剖面线时应
A.
倾斜方向相同且间隔相同
B.
倾斜方向相反
C.
采用粗实线
D.
采用虚线
【单选题】According to the section "Lego Is Looking For Other Materials To Use," why has it been hard for Lego to replace plastic with a new material?
A.
because it is hard to find a material as strong as plastic
B.
because it is hard to find a material as cheap as plastic
C.
because it is hard to find a material as safe as plastic
D.
because it is hard to find a material as colorful as plastic
【单选题】蓄电池在汽车上的主要作用是( )。
A.
用来充电。
B.
用来吸收发电机的过电压,保护电子元件
C.
用来给起动机供电,起动发动机。
D.
做备用电源。
【单选题】订单里夹杂着尖货商品和普通商品怎么办?
A.
等尖货仓发完尖货商品后,卖家再发非尖货商品后点击“全部发货”
B.
所有商品都由卖家自己发
C.
卖家什么都不需要做
D.
卖家发非尖货商品后点击“部分发货”,尖货商品由尖货发出
【判断题】She knows it will be hard to leave her boyfriend behind because she has been with him many years.
A.
正确
B.
错误
【单选题】A ball of clay falls freely to the hard floor. It does not bounce noticeably, and it very quickly comes to rest. What, then, has happened to the energy the ball had while it was falling?It has been us...
A.
It has been used up in producing the downward motion.
B.
It has been transformed back into potential energy.
C.
It has been transferred into the ball by heat.
D.
It is in the ball and floor (and walls) as energy of invisible molecular motion.
【单选题】People found it hard to so much advertising in TV series that a rule has been made to ban it. [     ]
A.
catch up with
B.
put up with
C.
get along with
D.
get away with
【单选题】装配图中,相邻两个金属零件画剖面线时应( )。
A.
倾斜方向相同且间隔相向,
B.
倾斜方向相反
C.
采用粗实线
D.
采用虚线
【单选题】One feels it hard to fit in with a new culture _______ he has been accustomed to his won culture.
A.
the moment
B.
which
C.
now that
D.
as
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