我们身处在自然环境中，一年接受的宇宙射线及其他天然辐射照射量约为3100微西弗（1西弗等于1000毫西弗，1毫西弗等于1000微西弗），用科学记数法可表示为（ ）
A：3.1×106西弗
B：3.1×103西弗
C：3.1×10-3西弗
D：3.1×10-6西弗
从下面方框中选择正确的单词并用其适当形式填空，使短文意思完整、通顺。
come, for, good, daughter, one, have, June, banana, when, we
Dear Jenny,
My name is Alan. I'm a 12-year- old girl. I'm the only ____ in my family. My birthday is on ____ 1st. It's the ____ day of the sixth month. It's also the Children's Day(儿童节). My parents ____ a party for me on that day. My friends ____ to the party. They bring(带来) me many birthday presents(礼物), and they sing Happy Birthday to me. ____ eat some strawberries, oranges and ____. We eat chicken and cakes ____ dinner. We also play games. We have a ____ time! How old are you? ____ is your birthday? Can you tell me?
Alan
My bike is Lucy's.
