Quinine is used to help cure __________.

Quinine was extracted from the cinchona bark in _________.

The medicines that we take today are mostly extracted from ________.

The early people used to ________ when they were ill.

Read the text carefully and then choose the correct answers.

Years ago, because of the lack of good medical care, diseases were the most terrible threat to the early people. Of course, they had no pills, tablets or capsules as we do today. They used to eat herbs or three bark to cure many diseases. They also knew that food had great effect on their health. Actually the medicines that we take today are mostly extracted from herbs, tree bark, plants and food. For example, in the 17th century, the Peruvian Indians ate cinchona bark when they had a fever. They learned this from experience only. Until 1816, some pharmacists extracted quinine from the cinchona bark. It is used in the treatment of malaria, a disease transmitted by the anopheles mosquito and common in the tropical countries. Quinine is also used to help cure other diseases. However, if a child use quinine for a long time, he or she will have rickets.

Years ago, ________.

If a vaccine is found ________.

What are laboratory product companies doing ?

Up to now _______ in Toronto.

Why did SARS spread in Toronto?

Read the text carefully and then choose the correct answers.

In a study released early on the JAMA web site, researchers from the University of Toronto and hospitals in the area describe the rapid spread of the coronavirus that causes severe acute respiratory syndrome (SARS). Beginning with a single patient at a community hospital who acquired the virus from another family member who had traveled to China, health care workers became infected. Further spread occurred as patients were transferred among hospitals before the source of inflections and the nature of SARS were identified. Laboratory product companies are working on a test that could be used to diagnose SARS quickly. Many - drug companies are ready working on a SARS vaccine. Even if a vaccine is found, it will surely take several years before it is available for wide public distribution.

Which causes SARS?

My friend and I …………… for too long.

He ………… here for six months.

I …………….. a cold for two weeks.

They ……………. skiing since they were 15.

He ………….. to France.

This is the first time I ………….. to Germany.

Kathy …………….. for three different companies since graduating two years ago.

I …………….. three books by the same author since the last month.

………… you …………. abroad this year?

John ……………. for three tests this month.

The team ……………. numerous setbacks so far.

We ………………. three power cuts this week.

They ……………… at the airport.

The rain ……………….. . It’s been raining for 3 hours.

I ……………. the report yet.

Man ……………… great things.

Science …………. in leaps and bounds.

Travel ………… into a huge industry in the last few decades.

He………. more concerned about his social status since he started working there.

Choose the correct answer to complete the sentence

You ……………… a lot since the last time I saw you.

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