根据句意,用括号内所给单词的正确形式填空。 1. This is Li Ming. He _____ (have) big hands. 2. I have two big _____ (foot). 3. —Does she _____ (have) a small mouth? —Yes, she does. 4. Look! Her _____ (eye) are big. 5. My hair _____ (be) black (黑色的) and long.
【单选题】An economy’s production function has the constantreturnstoscale property. If the economy’s labor force doubled and all other inputs stayed the same, then real GDP would
A.
stay the same.
B.
increase by exactly 50 percent.
C.
increase by exactly 100 percent.
D.
increase, but not necessarily by either 50 percent or 100 percent.