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问题 多项选择题

使用安全电压也必须注意使用环境，在（）等情况下，必须使用24V或者更低等级的电压

A、充满导电粉末

B、相对湿度较高

C、酸碱蒸汽浓度大

D、周围温度较高

答案

参考答案：A, B, C

单项选择题

投资者目前持有一期权，其有权选择在到期日之前的任何一个交易日买或不买1000份美国长期国债期货合约，则该投资者买入的是（）。

A.欧式看涨期权

B.欧式看跌期权

C.美式看涨期权

D.美式看跌期权
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单项选择题

Many students have hobbies, such as reading, painting, growing vegetables in their gardens, and looking after animals. Some hobbies are relaxing and (16) are creative. Hobbies can develop your interests and help you learn new skills.
David Smith is a student, and his hobby is writing. (17) the sumer of 2000, he spent four weeks on a summer camp. As well as the usual activities, such as sailing, climbing and mountain biking, there was a writing workshop with a professional (18) "She asked us to imagine that we were in a story. Then we wrote about our (19) at the camp. "
In senior high school David wrote a story about teenage life, and it (20) as a book in 2003. Many teenagers love his book, and as a result, David has become a (21) young writer.
David has been very lucky (22) his hobby has brought him enjoyment and success, but he is (23) interested in many other things. "I like playing volleyball, too" says David. "I spend some of my free time playing volleyball for my school team. (24) I’ll write more books in the future, but I’m not sure. "
It’s sometimes difficult (25) that we shouldn’t spend all our time on our favourite hobby. There are many other interesting things to do in life, and we should try to do something new or different.

Ⅱ. 完形填空/Cloze

A．manager

B．doctor

C．singer

D．writer
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