两个氨基酸在缩合时产生水，其中水分子中的氢来自[ ] A．羧基中的氢 B．氨基中

阅读理解。

     Become a volunteer and help those who need your help in your community!

     Volunteer work includes helping the poor, helping the families whose houses weredestroyed by national disasters or creating green spaces for neighborhood families. Whichever service activity you choose, you

have the "power of one"to make a difference and create a real change in the community!

     Our holiday volunteer jobs are open to all Americans. You don't need any special skills to join and

there are no age limits. With Biosphere Expedition (生物探险), you can be a wildlife and environmental

volunteer for anywhere from two weeks to two months.  You'll work with local scientists, and the leaders

from Biosphere Expedition will be by your side.

     We need students at the age of 16 and up who study at school and want a chance to use their talents,

skills and knowledge to help the little kids. They most have enough patience and are warm-hearted. Join

the Volunteer Service Center today! Volunteers are the greatest people in the world. Let's work together

to make the world a better place.

1. The volunteers can        in the community.

A. look after pet animals

B. help the people who are poor

C. build a house for the homeless

D. clean up the yards

2. The Biosphere Expedition is likely to be held           .

A. for three months

B. during a holiday

C. only by local scientists

D. between America and China

3. If Wu Dong is            years old, he may join the Volunteer Service Center.

A. 11                            

B. 13

C. 15                            

D. 17

4. Which of the following is TRUE?

A. The volunteer should create green spaces for all the families.

B. The volunteer can choose any service activity in the community.

C. To join the holiday volunteer work, special skills are required.

D. The student who doesn't study at school can be a volunteer to help the little kids.

5. What is the best title for this passage?

A. Volunteers Wanted.

B. A Job Interview.

C. An Expedition Club.

D. Education Service.

葡萄胎、侵袭性葡萄胎可靠的鉴别点是

A．子宫增大的速度
B．有无黄素囊肿
C．尿妊娠试验稀释倍数
D． * * 有无转移病灶
E． * * 流血量多少

党的十八届三中全会强调，要健全人大讨论、决定重大事项制度，各级政府重大决策出台前要向本级人大报告。这是因为

①人大代表享有审议权和决定权  

②我国根本政治制度是人民代表大会  

③人民代表大会是我国国家权力机关 

④人民代表大会制度的组织和活动原则是民主集中制

A．①②

B．②③

C．②④

D．③④

全球航线上，在相同信噪比的情况下，罗兰C地波在海上的作用距离最远的区域是（）。

A．北大西洋（夏季）

B．北大西洋（冬季）

C．大西洋（赤道）

D．太平洋中部

不良反应最小，可进入脑脊液的咪唑类抗真菌药是( )。

A．克霉唑
B．咪康唑
C．氟康唑
D．酮康唑
E．氟胞嘧啶