- A.going through a biological process
- B.collecting the fiber made by spiders
- C.adopting a certain chemical approach
- D.combining silkworm fiber with spider silk
- A.the strongest
- B.the most flexible
- C.light and strong
- D.strong and flexible
- A.imitating spider silk
- B.raising spiders on farms
- C.transplanting spider genes
- D.growing various bacteria
- A.Spider silk is still the most durable thread in existence.
- B.The U.S. Army is making bulletproof vests with spider silk.
- C.Scientists have made jeans of spider silk that don't wear out.
- D.A golden silk spider's web is strong enough to stop a plane in midair.
- A.make bicycling easier
- B.design better kinds of bicycles
- C.pave roads in the city
- D.publish bicycling magazines
- A.Only kids and teenagers liked bikes.
- B.People mainly rode mountain bikes
- C.Adults rode bikes mainly for fun.
- D.Mountain bikes did not exist.
- A.too heavy
- B.difficult to control
- C.expensive to keep
- D.unreasonably priced
- A.were faster than horses
- B.better suited roads in the city
- C.involved less expense than horses
- D.could be used for traveling in the country
- A.knew little about insects
- B.rarely listened to their children
- C.wouldn't change their behaviour
- D.would try to learn more about insects
- A.the importance of observation
- B.the order of animal intelligence
- C.the difference between children and adults
- D.the importance of communication and understanding
- A.He regarded the flies as unhappy.
- B.He thought flies were poor in hearing.
- C.He considered Sophie's report interesting.
- D.He considered Sophie's report ridiculous.
- A.were wildly mad at the butterfly
- B.couldn't understand the butterfly
- C.were not as clever as the butterfly
- D.did not pay attention to the butterfly
- 19
-
____
- A.wasted
- B.turned
- C.devoted
- D.channeled
- 21
-
____
- A.action
- B.practice
- C.challenge
- D.performance
- 22
-
____
- A.can
- B.must
- C.may
- D.should
- 23
-
____
- A.into
- B.by
- C.for
- D.at
- 24
-
____
- A.ran
- B.run
- C.running
- D.to run
- 25
-
____
- A.length
- B.area
- C.track
- D.circle
- 26
-
____
- A.take
- B.catch
- C.maintain
- D.hold
- 27
-
____
- A.even
- B.also
- C.yet
- D.thus
- 28
-
____
- A.brings
- B.makes
- C.draws
- D.uses
- A.increases
- B.will increase
- C.is increasing
- D.will have increased
- A.carry off
- B.carry over
- C.carry out
- D.carry away
- A.in case
- B.in no case
- C.in this case
- D.in that case
- A.is feeling
- B.is felt
- C.was feeling
- D.feels
- A.should give
- B.ought to give
- C.ought to have given
- D.must have given
- A.When
- B.While
- C.What
- D.Where
- A.turn up
- B.turn down
- C.turn out
- D.turn in
- A.recognized
- B.recognizing
- C.to be recognized
- D.being recognized
- A.set in
- B.ran out
- C.gave up
- D.got over
- 39
-
Companies spend millions of dollars trying to convince customers that their products are to others'.
- A.outstanding
- B.valuable
- C.superior
- D.unique