[单项选择]The passage makes it clear that Calen ______.


A. was regarded by medical men for more than a thousand years
B. lacked proper training for medical research
C. wrote the first book on anatomy
D. used human bodies for his experiments

[单项选择]According to the passage what makes a good friend


A. Mutual trust and common interests.
B. Teasing each other and trust.
C. Playing together and similar liking.
D. Similar liking and joking with each other.

[单项选择]It can be inferred from the passage that a clear view of the sun's outer layer is usually vented by_______.

[单项选择]According to the passage, what makes acquisitions easier

[单项选择]The personnel manager makes it clear that for security reasons, no one is allowed to enter the building ______ presenting a photo ID card.
A. unless
B. without
C. because
D. if

[单项选择]The author makes it clear that the Syracusan dekadrachm and the German taler mentioned in the passage are ______.


A. handmade Western coins
B. worth about a thousand dollars each today
C. made out of different metals
D. noted for their craftsmanship

[单项选择]According to the passage, what makes language learning easier for some people than for others


A. Some people learn grammar more quickly than others.
B. Successful language learners use special techniques,
C. Some people have good teachers and good books.
D. Successful language learners are more intelligent than others.

[单项选择]The company' s employment policy makes it clear that men and women have ______ opportunities.


A. equivalent
B. equal
C. identical
D. balanced

[单项选择]In the fourth paragraph, the author makes it clear that ______.
A. the government which is in charge of powers such as the making of laws must conduct the current affairs of the country but also think ahead and prepare the nation of tomorrow.
B. the nationals of any country are accountable for social choices they make.
C. the source of supply and wealth of any country can and will be consumed entirely if proper steps are not taken.
D. The people of any given country have a natural tendency to use unreservedly and unwisely their own resources.

[单项选择]

Passage Five
On a clear night you can see many stars in the sky. These stars are millions of miles away. Are there living things on any of the stars People have always thought about this question. They could not find the answer before now. Today scientists know more about space than ever before. Some machines can help them look for the answer.
How will scientists do this People can’ t go to the stars. The stars are far away. A person would take hundreds of years to the next star in a spaceship. So scientists are sending out radio signals. These signals travel in space at the speed of light. At that speed, radio signals will take 25 years to reach the next star. The signals ask "Is there anyone out here". Living things in space must have machines to hear the signals. We will not get an answer to our signals for more than 50 years. However, scientists are already listening. Someone from space may be trying to send signals to us, too.
S
A. 25 years
B. 50 years
C. hundreds of years
D. a few years