题目:
()
A.
B.
C.
D.
答案:
参考答案:A
解析:
原数列可变为
()
A.
B.
C.
D.
参考答案:A
解析:
原数列可变为
阅读理解。
14-year-old Jason Morgan talks about an exciting science project.
Last month I got the chance to take part in an underwater research project in an area of the Gulf of
Mexico called the Flower Gardens. A team of professional researchers' led by the scientist Dr Matt Phillips,
was trying to learn more about the fish and different creatures that live in this part of the sea. The Flower
Gardens are a long way from the shore (海岸) and we spent three days on a boat.
The team used a piece of underwater equipment called ROV to collect information. The ROV was great fun. It was controlled by a computer on the boat, and I was allowed to operate it a few times.
However, the thing I enjoyed most was diving (潜水) into the water. At first, I was quite scared---mainly
because I couldn' t see land in any direction. But as soon as I jumped into the water, I wasn't afraid anymore.
It was amazing to see the colorful fish swimming around and I could see all the ways to the Flower Gardens,
which are almost 30 meters down. I will never forget the Flower Gardens. The trip was like a holiday but I also
learnt new things about science and research projects. It was a great opportunity and it has made me think
about my goals (目标) in life. The experience will help me work harder to become a scientist.
1. Jason and the team stayed on the boat for ______ days.
A. three
B. two
C. five
D. eight
2. What did Jason think of the ROV?
A. It was boring.
B. It was difficult to operate.
C. It was great fun.
D. It was an expensive piece of equipment.
3. Jason didn't ______ in the Flower Gardens.
A. operate the ROV
B. walk along the shore
C. dive in the water
D. see many colorful fish
4. What influence has the trip had on Jason?
A. It has changed his opinion of science.
B. It has improved the way he works in a team.
C. It has made him more interested in the sea.
D. It has encouraged him to work harder towards his goals.
5. What might Jason write in his diary about the trip?
A. It was interesting to work with Dr Phillips and his team but I wish someone else had been on the trip.
B. The Flower Gardens are beautiful but scientists are worried that pollution are worried that pollution.
C. The trip was like a holiday and I saw some amazing fish. The only thing I dislike was
collecting information about the sea.
D. Going to the Flower Gardens was great fun. I now know much more about science but
I realize there's still a lot more to learn.
不属于遗传性疾病的是()
A.血友病
B.白化病
C.糖尿病
D.Down病
E.慢性支气管炎
医师经执业注册后()
A.只准从事医疗业务
B.只准从事预防业务
C.可以从事相应的医疗、预防、保健业务
D.不得从事医师执业活动
E.可以重新申请医师执业注册
属于停送电的危险源是()。
A、带电检修、搬迁、移动电气设备
B、检修后将物件、工具遗忘在设备内
C、检修设备时,采用约时停送电
流体流动时产生阻力损失的根本原因是()
A.边界条件
B.流速大小
C.黏度
D.惯性