13．
Do you suppose Darwin，one of the greatest scientists of all time，really did fools'（傻瓜的） experiments？Or did he do experiments that were so simple and basic（基礎(chǔ)的） that other people just thought they were foolish？
Sometimes，people think they already know the answer to a question or a problem．Sometimes，they really do know an answer，but without thinking they are important．
Charles Darwin didn't just think he knew something．And，he believed all things could be important however simple they seemed to be．
Charles Robert Darwin Suppose you drop pieces of paper that are of exactly the same size and shape．If you drop them at the same time in the same place，they will fall in the same way．Now make one of the sheets of paper into a tight little ball and let it drop along with the other pieces．What happens？You have done an experiment that is so simple that you might think it couldn't be worth anything．
But this simple experiment is important．It explains part of our present day understandings of physics（物理學(xué)）ideas that were worded out long ago by Galileo and Newton．And these understandings set asidesome of ancient Greek（古希臘）physics．
The scientist sometimes stops to look at very simple things and to think very hard about them．Even the simplest idea，which we might think is foolish，can shake the foundations（基礎(chǔ)） of science．
34．The passage tells us that Charles DarwinC．
A．was a great English scientist
B．a(chǎn)lways liked doing the experiments that others thought difficult
C．thought even the simplest thing was important
D．didn't get along well with others
35．The underlined phrase"set aside"in Paragraph Five most probably means"A"．
A．throw away
B．receive
C．help with
D．learn from
36．The writer of the passage tries toD．
A．show us that Charles Darwin，Galileo and Newton are the greatest scientists in the world
B．draw the conclusion that basic sciences are simple things
C．prove that two sheets of paper，with the same size and shape，will fall at the same speed
D．draw our attention to everyday things around us
37．Which one of the following is TRUE according to the passage？B
A．Darwin really did fools'experiments．
B．According to some people Darwin did foolish experiments．
C．It is believed by all the people that things could be important though they seemed to be simple．
D．Galileo and Newton worked out ancient Greek physics．
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