阅读短文，为每段话选择中心意思

词汇预约：alien(性质不同的，陌生的)　outmoded(过时的，老式的)　habitat(生境，栖息地)　shunned(避开，回避)　bacteria(细菌)vertebrate(脊椎动物，有椎骨的)

选择阅览：

A．After habitat destruction, the biggest threat to biodiversity is invasion by alien species．

B．More species will mean fewer medicine．

C．At high latitudes, entire forest type are expected to disappear, to be replaced by new ones．

D．Even if we stop killing species today, nobody reading this will see wildlife restored to its former glory．

E．Biodiversity is good for humans．

F．The romantic notion of “wilderness” is fast becoming outmoded．

正文阅读

1．________

Scientists found that human activity has displaced the natural habitat over two-thirds of the habitable surface of the planet．Much of the undisturbed land is merely rock, ice and blowing sand, already shunned by wildlife．

2．________

These have arrived mainly through trade, tourism and biocontrol, invasive plant species already cover 400 000 square kilometers of the US, and are spreading at 12 000 square kilometers a year．At that rate, the whole of the US will fall to outside species within 750 years．

3．________

By destroying it, we could bring the axe down on our own heads．Rural communities in more than 60 countries get much of their neat from wild animals．Overpopulation, famine and the spread of high-powered weapons are killing off these creatures．

4．________

Three-quarters of the top 150 prescription drugs in the US are lab versions of chemicals found plants, fungi, bacteria and vertebrates．The WHO estimates that more than 60 per cent of the world population relation relies on plants for primary healthcare．There are 3000 plant species used in birth contra lone．

5．________

The dent already made in biodiversity will take 10 million years to repair itself．

根据句意和首字母完成句子

________　________(比较)your bike, mine is light．

句型转换

I was tired of listening to your complaints．

I ________　________　________　________ listening to your complaints．

I ________　________　________ your complaints．

句型转换

Sheep provide us wool．

Sheep provide wool ________　________．

句型转换

Reading English every morning will benefit you a lot．

You will ________ a lot ________ reading English every morning．

句型转换

This failure affected him greatly．

This failure ________　________　________　________　________ him．

句型转换

Because of his help, we finished the work in time．

________　________ his help, we finished the work in time．

句型转换

He is busy with his homework．

He is ________ with his homework．

He is ________　________　________ his homework．

句型转换

You can’t find him anywhere．

He is ________ to be found．

句型转换

It took me two hours to finish my homework．

I ________　________　________　________　________ my homework．

I ________　________　________　________ my homework．