题目内容

Not until ________ the Internet ________ that the Chinese sailors were rescued by the European Union Task Force.

A．did I surf; did I know B．did I surf; I knew

C．I surfed; did I know D．I surfed; I had know

 

C

【解析】C　考查倒装。句意：直到我上了网才知道中国海员被欧盟工作组救了。not until引导的时间状语从句位于句首时，从句不倒装，主句倒装。故C项正确。

 

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In order to be a strong partner with the Asia?Pacific region, American President Obama thinks it is ________ to have a strong relationship with China.

A．vital B．potential C．specific D．awkward

 

—How can I use the equipment?

—Well, just refer to the ________.

A．directions B．explanations

C．expressions D．introductions

 

There are many new central leaders in China now, ________ many once worked in the western provinces.

A．in which B．of whom

C．in whom D．for whom

 

—I'm sorry to tell you the ballet Nut Cracker has been cancelled.

—Oh, no! ________.

A．It's a pity B．I don't care

C．It's a deal D．It's not my cup of tea

 

Around two o'clock every night, Sue will start talking in her dream. It somewhat ________ us.

A．bothers B．had bothered

C．would bother D．bothered

 

Siberian Tigers ________ and killed at such a speed that they will disappear from the earth in the near future.

A．hunted B．are hunted

C．are being hunted D．had been hunted

 

—The town is so beautiful! I just love it.

—Me too.The character of the town is well ________.

A．qualified B．preserved

C．decorated D．simplified

 

Do you have trouble getting started in the morning? Do you have problems learning early in the day? If you do, you are not alone, __1._ They learn better at night than they do in the morning.

To investigate when cockroaches(蟑螂) learn best, researchers at Vanderbill University tested the insects for which odor(peppermint 薄荷 or vanilla 香草) they preferred. Most cockroaches preferred the smell of vanilla to that of peppermint at all times. _2._ Therefore, the scientists trained the cockroaches to prefer the peppermint smell by rewarding the insects with a taste of sugar water when they approached a peppermint smell. _3.__

When the cockroaches were trained at night, they remembered the new associations(peppermint＝sugar water; vanilla＝salt water) for up to 48 hours. However, if the cockroaches were trained in the morning, they quickly forgot which smell went with which water. __4._

So, cockroaches learn better at night than they do in the morning. _5._ Because of this, it is likely that information they gather at night will be more useful to them. These experiments provide some clues about the interactions between body rhythms, learning and memory.

A．When these insects moved toward a vanilla smell, on the other hand, they were punished with a taste of salt.

B．This result thus shows that the time when they were trained decided the effect of their learning.

C．They are often more active and tend to search for food during the night.

D．They were also found to like sugar water, but not salt water.

E．Cockroaches have the same problem!

F．But they prefer warm conditions found within buildings.

G．Pest species adapt easily to their environment.

 

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