loading3. It's hard to explain (select) why some people can recover from illnesses on their own, while others need to take a lot of medicine to get better.
4. At first, the scientists' tests seemed to support (select) the idea that vitamin C keeps colds away, but later tests proved that the idea was wrong.
5. I predict (select) that if you drink a lot of tea with honey and lemon, your sore throat will go away soon.
6. Professor Klein published a paper that said that eating cheese can cure people who have cancer, but most scientists who read it rejected (select) this idea and thought it was crazy.
7. Jimmy's mother made a prediction (select) that if he ate a lot of cake and candy, his stomach would hurt later.
8. Most of Professor Levy's research (select) is about using vitamins to help relieve headaches.
9. The professor gave the class a very clear explanation (select) about why children and adults need to use different types of medicines.
10. After college, Maria is going to move to a small town in a rain forest in Brazil so she can research (select) how people there make medicines from plants and other natural ingredients.
Read the passage “Hypotheses”. Choose true or false for each statement.
All of your answers are correct. Well done!
1. A hypothesis is an idea that explains things we see. true
2. Only scientists can think of hypotheses. false
3. There must be a way to show that a scientific hypothesis
true
is wrong.
4. There must be a way to check a scientific hypothesis by
true
measuring or observing something.
5. All hypotheses are testable. false
6. The statement \
true
catching a cold\
7. Repeated tests support the hypothesis that taking vitamin
false
C keeps colds away.
8. Sometimes a hypothesis might seem to be true after the first test, but scientists reject it later after a different true test.
Read the passage. Choose the idea that each underlined phrase refers to.
As we saw earlier, our friends and family often give advice about avoiding colds (for example, the advice to wear a hat or take vitamin C). This kind of advice comes in part from what they know about how our bodies fight colds. All of your answers are correct. Well done!
1. What does This kind of advice refer to?
2. What does They refer to?
A. colds
B. friends and family C. pieces of advice
A. advice about avoiding colds B. advice from friends and family
C. advice to wear a hat or take vitamin C
Read the passage. Choose the idea that each underlined phrase refers to.
All of us form hypotheses about why things happen. These come from our understanding of the world.
All of your answers are correct. Well done!
1. What does These refer to?
A. all of us B. hypotheses C. things that happen
Read the passage. Choose the idea that each underlined phrase refers to.
Of course, scientists do not show every hypothesis to be false—the important point is that proving themfalse is possible. This is why personal opinions, such as “It is wrong to cheat on exams,” are not scientific—each person has a different idea about right and wrong.
All of your answers are correct. Well done!
1. What does them refer to?
A. scientists B. hypotheses C. experiments
2. What does This refer to?
A. the fact that people have different opinions about right and wrong
B. the fact that scientists don't show that every hypothesis is false
C. the fact that a hypothesis must be falsifiable
Read the passage. Choose the idea that each underlined phrase refers to.
Not all hypotheses are testable. For example, we cannot test hypotheses that need a supernatural force. If something is supernatural, it does not follow the laws of nature, and we cannot predict its behavior: we can’t measure anything about it. All of your answers are correct. Well done!
1. What does it refer to?
A. a hypothesis about supernatural forces B. a test of supernatural forces C. something that is supernatural
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Read the passage. Choose the idea that each underlined phrase refers to.
However, sometimes a hypothesis might seem to be true after the first test, but scientists reject it later after a different test. This is what actually happened with the hypothesis that taking vitamin C keeps colds away. A 1970 book by the Nobel Prize winner Linus Pauling agreed with this hypothesis. Since then, however, repeated, careful tests have failed to support it.
All of your answers are correct. Well done!
1. What does This refer to?
A. scientists rejecting a hypothesis after more tests
B. scientists testing a hypothesis
C. scientists thinking the hypothesis about vitamin C was true
2. What does Since then refer to?
A. the time Linus Pauling wrote his book B. the time scientists rejected the hypothesis
C. the time scientists discovered that vitamin C keeps colds away
Choose the correct phrases to complete the text. both groups get the same number of colds each person has a different idea about right and wrong
it does not follow the laws of nature
it must be possible to check them by seeing or measuring things
that need a supernatural force you get more colds in cold weather
you must be able to imagine a way to show that it is false
All of your answers are correct. Well done!
2 A scientific hypothesis must be falsifiable. That is, you must be able to imagine a way to show that it is false , such as by giving an example showing that it is wrong. For instance, think about the hypothesis thatyou get more colds in cold weather . We could look at one group of people who spend time in cold
temperatures and another group who stay in warm temperatures. If both groups get the same number of colds , the hypothesis might be false. So, this hypothesis is falsifiable. Of course, scientists do not show every hypothesis to be false—the important point is that proving them false is possible. This is why personal opinions, such as \— each