若正常人血铅含量近似对数正态分布,拟用300名正常人血铅值确定95%正常值范围,最好采用的公式是()
A.A
B.B
C.C
D.D
E.E
参考答案:D
He’s ______ China twice. He’s visited many interesting places there.
A.been to
B.gone to
C.going to
D.going to go to
用画线词的反义词填空。
1. Bring your math book here and _______ away your exercise books.
2. I like short hair. I don't like _______ hair.
3. My shoes are too old. I want to buy _______ ones.
4. The store sells school things. You can _______ some colored pencils there.
5. I think this book is very easy and that book is very _______.
6. Watching TV is too boring. But playing sports is very _______.
7. His first name is John and his _______ name is Green.
8. The shirt is too big for me. Give me a _______ one, please.
9. The blackboard is black. The words on it are _______.