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问题 单项选择题

两种摩尔质量不同的理想气体，它们压强相同，温度相同，体积不同。则它们的：（）

A.单位体积内的分子数不同

B.单位体积内的气体的质量相同

C.单位体积内的气体分子的总平均平动动能相同

D.单位体积内的气体的内能相同

答案

参考答案：C

解析：

单项选择题

合同履行过程中，当事人应当遵循诚实信用原则，根据合同性质、目的和交易习惯履行 ( )的义务。

A．抗辩

B．通知

C．合作

D．协助

E．保密
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单项选择题

One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (16) . She cared for them and felt great love for them.
Once the (17) and per of the two birds flew from the cage. Therefore, (18) he flew close, she grasped him (19) . She felt glad, but suddenly she felt the bird go limp. She opened her hand and (20) in horror at the dead bird.
She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (21) . She lifted him from the cage and (22) him softly into the air. The bird circled once, twice, three times.
The girl watched delightedly at the bird’s enjoyment. Her heart was no longer (23) with her loss. Suddenly the bird flew closer and (24) softly on her shoulder. It sang the sweetest melody that she had ever heard.
The fastest way to (25) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!

Ⅱ．完型填空/Cloze

A．because

B．as

C．if

D．since
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