为了阻止全球变暖的趋势,1992年联合国专门制订了《联合国气候变化框架公约》,该公约于同年在()签署生效。
A.哥本哈根
B.东京
C.里约热内卢
D.夏威夷
参考答案:C
苏伊士运河沟通的海洋有[ ]
A、红海和地中海
B、黑海和里海
C、印度洋和太平洋
D、红海和印度洋
—The plane is due to take off at 7:50 from the airport.
—________ we fail to arrive there in time?
—Try to take another flight then. [ ]
A. What if
B. As if
C. Even if
D. Only if