766.The human growth hormone, made by the pituitary gland, is secreted during sleep in higher concentrations than when awake. (D) in higher concentrations during sleep than during waking hours (E) in higher concentrations when asleep than when awake 我的理解:
768.The investor who is uncertain about the future is more likely to put money into blue-chip stocks or treasury bills than into gold.
(A) than into
(B) than they do
(C) than they are
(D) as into
(E) as
the key:A