化学反应中旧键断裂需要（ ）能量
A．吸收
B．放出
C．不吸收也不放出
D．不一定
答案：A
断裂化学键一定是吸收能量的，形成化学键一定放出能量。答案选A。
Earlier on Monday, Obama's spokesman said Washington _____ Karzai as the legal leader of Afghanistan
and would continue talks with him. [ ]
A. concerned
B. commanded
C. rewarded
D. recognized
- Hello, Mary! How are you?
- .
A. How are you?
B. Nice to meet you.
C. Fine, thanks.
