指(趾)甲变平,甚至凹下呈现勺状(反甲)是()的特殊表现之一。
A.严重缺铁性贫血
B.严重缺钙
C.严重缺钠
D.严重缺钾
参考答案:A
句型转换。
1. My father had a headache yesterday. (改为同义句)
My father______ a pain ______ his head. My father's head ______ yesterday.
2. Carla offered me a cup of tea. (改为同义句)
Carla offercd a cup of tea ______.
3. Rick is very friendly to his friends, and they are very friendly to him, too. (改为同义句)
Rick ______ ______ ______ with his friends.
4. I'll fly to Paris if I have a lot of money.(改为虚拟语气)
I ______ ______ to Paris if I ______ a lot of money.
5. They want to go to the park instead of staying at home. (改为同义句)
They'd ______ go to the park ______ stay at home.
读下面某区域局部图和某日降水量图,回答下列小题。
甲图所示区域的自然地理特征是()
A.地形以平原为主,平原面积广大
B.自然带为落叶阔叶林带
C.中小河流众多,水能资源丰富
D.土壤肥沃,黑土分布广