初中英语人教版初三年级上册24

[00:17.89]Below is some information that you may find about sharks in the library.
[00:58.57]Sharks have been around for a very long time.
[01:04.91]It seems they have been on earth for thousands of years,
[01:12.07]and have changed very little.
[01:37.04]It seems they have been on earth for thousands of years,
[02:32.40]A shark is a fish, but it has many differences from a fish.
[02:54.84]For one thing, if a shark stops swimming,it will sink.
[04:41.18]Not all sharks are alike¹.
[04:44.94]There are between 200 and 250 kinds of sharks.
[04:52.99]hey come in different sizes. The largest can be as long as 15 metres.
[06:38.37]It eats plants from sea, but many sharks feed on fish,
[06:47.22]other sea animals, smaller sharks and sometimes they cat dangerous
[08:03.68]They have attacked a number of people off the beaches of America.
[08:11.76]Australia, New Zealand and South Africa also have shark attacks.
[08:52.19]In some places there are watchtowers on the beaches to warn² people about sharks in the water.
[09:53.76]When a shark appears, a bell rings to tell the people to get out of the water.
[10:18.81]Sharks attack about 100  people a year in America.
[10:35.19]Perhaps the shark just thinks that the person is a kind of sea animal.
[10:44.55]or something good to eat!
[12:53.41]Look and write
[12:56.88]Look at the pictures below.
[13:01.04]Choose one picture and write what you know about that animal

1 alike   

adj.同样的，相像的；adv.一样地；同程度地　

参考例句：

• The twins are so alike that I can't tell which is which.这对双胞胎一模一样，我分辨不出谁是谁。
• All stories seemed dreadfully alike,no matter who told them.看来，不管谁讲，故事都是千篇一律的。

2 warn   

vt.警告，注意，远离；vi.提醒

参考例句：

• I must warn you that my patience is almost at an end.我必须警告你我已经没有耐心了。
• If you warn me in advance,I will have your order ready for you.你若预先通知我，我就能给您准备好了。