has never actually been observed, but is believed to be theoretically possible
is the series of small changes that transforms one species into another
lacks evidence, and therefore should not be considered a scientific fact
is an evolutionary process involving small changes within a species
occurs wherever there are environmental changes in a species' habitat
第1题：
You should （）the mooring lines according to the changes of draft.
第2题：
begun to change in the opposite direction
been weakening in strength for a long time
caused the changes on the polarities
misguided many a man and animal
第3题：
According to the passage, early-twentieth-century education reformers believed that ______.
A) different groups needed different kinds of education
B) special programs Should be set up in frontier communities to modernize them
C) corporations and other organizations damaged educational progress
D) more women should be involved in education and industry
第4题：
explains the dysfunctional genes present in hemoglobin
has been proved to be true by scientific investigations
is a theory that lacks sufficient evidence
has never taken place on any scale
provides insight into our biological cousins
第5题：
drug use
alcohol abuse
abandoning his post
setting fire
第6题：
district in which alcohol is prohibited
country that is suffering from drought
land where it has usually been very dry
wine that contains little alcoholic content
第7题：
Fossilized dinosaurs have shown many birdlike characteristics, such as bone structure and winglike arms.
If birds are in fact the descendants of dinosaurs, then it can be argued that the dinosaurs never really died out.
Flying dinosaurs such as the Pteranodon, which is not thought to have been related to modern birds, do not appear to have had feathers.
Soft tissues such as skin and feathers do not fossilize like bones, and therefore are far less likely to have left permanent evidence in the fossil record.
The thousands of dinosaur fossils excavated by paleontologists represent only a tiny fraction of the billions of dinosaurs that once lived.
第8题：
第9题：
may not carry on photosynthesis alone
supply food to the fungi
can’t live separately
aren’t recognizable as a species
第10题：
means that one can ignore other people’s criticism
means that one can impose his preferences on others
doesn’t mean that one has the right to do things at will
doesn’t mean that one has the right to charge others without evidence