1. --- that as both birds and mammals become larger, their metabolic rates er unit of tissue decrease, and they generally live longer.
(A) The truth
(B) If true
(C) It is true
(D) To be true
2. Asteroids are small and therefore very difficult to identify, even when --- to Earth.
(A) quite closely
(B) are being quite close
(C) are they quite closely
(D) they are quite close
3. A number of modern sculptors have rejected --- of minimal and environmental art and developed a style of extreme realism.
(A) which abstract qualities
(B) there are abstract qualities
(C) the abstract qualities
(D) the qualities are abstract
4. --- tributaries of the Mississippi River system were navigated by steamboats during the period before the outbreak of the Civil War.
(A) More than forty
(B) More than forty were
(C) Forty more than
(D) There were more than forty
5. Mary Eliza McDowell's introduction to social service came --- , when she assisted victims of the great Chicago Fire of 1871.
(A) was sixteen years old
(B) had sixteen years
(C) at age sixteen
(D) sixteen
6. Young herons are helpless for a few weeks --- they learn to fly.
(A) how
(B) before
(C) despite
(D) since
7. The history of painting is a fascinating chain of events that probably began with ---.
(A) ever made the very first pictures
(B) the ever made very first pictures
(C) the very first ever made pictures
(D) the very first pictures ever made