WHAT IS THIS PASSAGE MAINLY ABOUT
51. What is this passage mainly about?
A. The side effect of growth drugs
B. A medical breakthrough in growth hormones
C. The abuse of growth hormones
D. The problems of growth hormone- deficient children
51. What is this passage mainly about?
A. The side effect of growth drugs
B. A medical breakthrough in growth hormones
C. The abuse of growth hormones
D. The problems of growth hormone- deficient children