Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some (1) by the position of the Sun. Others navigate by the stars. Some use the Sun as (2) guide during the day, and then (3) to star navigation by night. One study shows that the homing pigeon uses the Earth’s magnetic fields as a guide (4) finding its way home, and there are indications that various other animals, from insects to mollusks (软体动物), can also make (5) of magnetic compasses. (6) is of course very useful for a migrating bird to be able to switch to magnetic compass when clouds cover the sun; (7) it Would just have to land and wait for the Sun to come out again. (8) with the Sun or stars to steer by, the problems of navigation are more complicated (9) they might seem at first. For example, a worker honeybee (10) has found a rich source of nectar and pollen flies rapidly home to the hive to (11) : A naturalist has discovered that the bee scout (12) her report through complicated dance in the hive, (13) she tells the other workers not only how far away the food is, but also what direction to fly in (14) to the Sun. (15) the Sun does not stay in one place all day. As the workers start (16) to gather the food, the Sun may (17) have changed its position in the sky somewhat. In later trips during the day, the Sun seems to move farther and farther toward the west. Yet the worker bees seem to have no (18) at all in finding the food source. Their inner (19) tell them just where the Sun will be, and they change their course (20) .

17（）

A:already B:yet C:certainly D:finally

Scientists around the world are racing to learn how to rapidly diagnose, treat and stop the spread of a new, deadly disease. SARS — Severe Acute Respiratory Syndrome — was (1) for the first time in February 2003 in Hanoi, (2) since then has infected more than 1,600 people in 15 countries, killing 63. At this (3) , there are more questions than answers surrounding the disease.
Symptoms start (4) a fever over 100.4 degrees F, chills, headache or body (5) . Within a week, the patient has a dry cough, which might (6) to shortness of breath. In 10% to 200% of cases, patients require (7) ventilation to breathe. About 3.5% die from the disease. Symptoms (8) begin in two to seven days, but some reports suggest it (9) take as long as 10 days. Scientists are close to (10) a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence (11) antibiotics or anti-viral medicines help, (12) doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of (13) . Scientists aren’t sure yet, but some researchers think it’s a (14) discovered coronavirus, the family of viruses that cause some common colds.
Most cases appear to have been passed (15) droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care for them have been most likely to (16) the illness. But recent developments in Hong Kong suggest that the (17) might spread through air, or that the virus might (18) for two to three hours on doorknobs or other (19) Health experts say it is (20) , though, that sharing an elevator briefly with an infected person would be enough to pass the virus.

Read the following text, Choose the best word(s) for each numbered blank and mark [A], [B], [C] or [D] on ANSWER SHEET 1.2（）

A:but B:and C:or D:yet

Scientists around the world are racing to learn how to rapidly diagnose, treat and stop the spread of a new, deadly disease. SARS — Severe Acute Respiratory Syndrome — was (1) for the first time in February 2003 in Hanoi, (2) since then has infected more than 1,600 people in 15 countries, killing 63. At this (3) , there are more questions than answers surrounding the disease.
Symptoms start (4) a fever over 100.4 degrees F, chills, headache or body (5) . Within a week, the patient has a dry cough, which might (6) to shortness of breath. In 10% to 200% of cases, patients require (7) ventilation to breathe. About 3.5% die from the disease. Symptoms (8) begin in two to seven days, but some reports suggest it (9) take as long as 10 days. Scientists are close to (10) a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence (11) antibiotics or anti-viral medicines help, (12) doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of (13) . Scientists aren’t sure yet, but some researchers think it’s a (14) discovered coronavirus, the family of viruses that cause some common colds.
Most cases appear to have been passed (15) droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care for them have been most likely to (16) the illness. But recent developments in Hong Kong suggest that the (17) might spread through air, or that the virus might (18) for two to three hours on doorknobs or other (19) Health experts say it is (20) , though, that sharing an elevator briefly with an infected person would be enough to pass the virus.

2（）

A:but B:and C:or D:yet

W: Have you found your book yet M:______

A:No. But I didn' t remember where I had put it. B:No. I am not sure what I have done with it. C:Not yet. And I' m sure I have lost it for ever. D:Still not. It seemed to. me I shall never get it back.

W: Have you found your book yet M:（）

A:No. But I didn’ t remember where I had put it. B:No. I am not sure what I have done with it. C:Not yet. And I’ m sure I have lost it for ever. D:Still not. It seemed to. me I shall never get it back.

W: Has the latest Time Magazine arrived yet Today's already Tuesday.M:______

A:Today' s already Monday. But it hasn' t arrived yet. B:Sorry, it' s late. Probably not till the day after tomorrow. C:It may arrive on Wednesday. D:Time Magazine, so far as I know, is the most popular for us New Yorkers.

The most active areas of pandemic influenza transmission currently are in central and eastern Europe. Focal(集中的) increases in rates during recent week were (51) in at least two eastern European countries. A high intensity of respiratory(呼吸的) disease activity with concurrent(同时存在的 ) circulation of pandemic influenza still (52) in parts of southern and eastern Europe, (53) in Greece,Poland, and Ukraine.
In Western Europe, influenza transmission remains (54) and widespread,but overall disease activity has peaked. All influenza viruses in Western Europe were pandemic H1N1 2009, (55) ,very small numbers of seasonal influenza viruses, covering less than 1% of all influenza viruses found, were reported in Russia. In (56) , limited available data indicate that active,, high intensity transmission is occurring in Northern African countries (57) the Mediterranean coast.
In Central Asia, limited data (58) that influenza virus circulation remains active, but transmission may have recently peaked in some places. In West Asia, Israel,Iran, and Iraq also appear to have passed their (59) period of transmission within the past month, though both areas continue to have some active transmission and levels of respiratory disease activity have not yet (60) to baseline levels. In East Asia, influenza transmission remains active but appears to be (61) overall. Slight increases in ILI were reported in Mongolia after weeks of declining activity following a large peak of activity (62) one month age.
In North America,influenza transmission (63) widespread but has declined quickly in all countries. In the tropical regions of Central and South America and the Caribbean, influenza transmis- sion remains geographically widespread but overall disease (64) has been declining or remains unchanged in most parts (65) for focal increases in respiratory disease activity in a few countries.

A:yet B:still C:however D:until