课时同步（外研版）高一下英语必修4Module6-1同步练习

Are you________ ________ tigers?

The clothes which________the famous football player's name sell________all through the year.

This is a matter of________importance I think.

At the________news, the________boy couldn't move or cry.

These two are well________in strength.

He________the old lady________buying the fake stamp.

I have been to many hotels but none of them can________this one for good service.

I'm sorry that you don't like the present, ________because I bought it________for your birthday.

He was suddenly________with a strange illness when he was about to finish the work.

________down the radio—the baby's asleep in the next room.

—Hey, what just happened to my computer? It suddenly froze and then came back on again!
—Oh, it seems that the computer has been a______ by the “Blaster”virus!
The 911 rescue team found the missing boy extremely f______， the wolves howling in the woods.
—Do you really believe there is human race in outer space?
—So far there is no proof that people from other planets do e______.
We couldn't cut the string because the edge of the knife was not s______ enough.
Even though he has lived in China for many years, Mark still can not a______himself to the Chinese customs.

Have you ever sat on a camel? Well, if you have, then you know how scary it is when the camel rises on its long wobbly(摆动的)legs. The rocking motion of a camel is a bit like a being tossed around in heaving seas. Small wonder then that the camel is often called the ship of the desert. Actually, the name owes its origins to the fact that camels were brought from the desert, to serve as beasts of burden in other countries.

We in India are only familiar with one species of camel, known as the Dromedary camel. This animal is singlehumped, has long legs and is found in the deserts of Asia and Africa. Another specie(the twohumped shortedlegged Bactrian camel)is found in parts of China and Central Asia.
Recently, scientists discovered what they think is a new species of wild camel that lives in a remote part of China. These mammals look very similar to the Bactrian camel but they have a unique feature—they survive by drinking salty water.
Strangely enough, scientists knew about the existence of the animal, but had no idea of their unique identity(特性). As a result, researchers now admit that these animals are not Bactrian camels as initially(最初)thought, but a new species. The only visible physical difference is that the saltwater drinking species has its humps further apart than the Bactrian camel.
Camels are most common in the African and Asian deserts, but fossil evidence shows that camels originated in North America about 45 million years ago. So how did they manage to come into Africa? Well, million of years ago, North America and Asia were connected by a land mass—the presentday Bering Strait.
Scientists think that the camels migrated into South America and across to Asia, disappearing almost entirely from the land of its origin. However, many researchers say that the South American llama(骆驼)is a direct descendant of the camel.
The camel is called“the ship of the desert”because________.

What's the difference between the Dromedary camel and the Bactrian camel?

What scientists don't know about the new species is________.

How can people tell the new species from the the Bactrian camel?

From the passage we can infer that________.