我国自然资源的国情是( )
A:种类有限,但数量较大
B:人均占有量多,种类也很多
C:数量不大,存在资源危机
D:自然资源丰富,但人均不足
—— __________ hard-working girl! Who is she? ——Tina. She tried to _________ many problems to learn Chinese.