A quarter of all bird species in the world are known to have become extinct during the past two hundred years

16. A quarter of all bird species in the world are known to have become extinct during the past
two hundred years
A. It has been acknowledged that one-fourth of all bird species have ceas
last two centuries.
exist over the
B. It is estimated that one-fourth of all bird species will become extinct within the next two
centuries.
C. It is known that two centuries ago the number of birds living on the earth was 25% greater
than it is today.
D. We are likely to cause the extinction of one-fourth of all bird species during the next two
hundred years.
17. Tom Higdon was dismissed from his job as a teacher in 1911 for suggesting that the children
of farm workers should be educated.
A. After being fired from his teaching position in 1911, Tom Higdon suggested that the children
of farm workers ought to be educated.
B. Tom Higdon's suggestions in 1911 that the children of farm workers didn't deserve to be
educated led to his dismissal.
C. In 1911, the teacher Tom Higdon was fired because he proposed that farm workers' children
be educated.
D. In 1911, Tom Higdon was fired from his post as a teacher for teaching the children of farm
workers, who shouldn't have been educated.
pre immigrants were attracted to the newly- created