菠菜与钙片同时食用容易生成草酸钙结石，因此服用钙片前后（）小时不能进食菠菜。
A、2小时
B、3小时
C、4小时
D、5小时
参考答案：A
A．yc=0，，zc=0，xc＞
B．yc=0，，zc=0，xc=
C．yc=0，，zc=0，xc＜
D．无法判断
在下列各句的空白处填入一个最恰当的单词，使句子意思完整，语法正确。
1. I like ______ through the jungle because I like thrilling vacation.
2. How about Florida beach? I'm sure you hope to visit somewhere ______.
3. She doesn't want to go to Hawaii this summer. She thinks it's too______.
4. You know English well. Could you give me some ______ for a holiday?
5. Can you ______the article into Chinese?
