火星的质量和半径分别约为地球的和，地球表面的重力加速度为g，则火星表面的重力加速度约为 （ ）
Our graduation party will be on June 28．
That's wonderful! Could you tell me______？（ ）
A．if all of our teachers joined us
B．where will it be held
C．who will give the performances
D．that we should wear school uniforms
May I pay the bill through WeChat？
______． Please scan the QR code（二维码） on the wall．（ ）
A．I'd like toB．I'm afraid not
C．Of course you canD．Never mind
Which of the following words is formed like "homework"？（ ）
A．inventorB．raincoatC．dishonestD．careless
When in Rome， do as the Romans do． We should behave_____ when travelling a broad．
That's quite true．（ ）
A．probablyB．hardlyC．highlyD．properly
What's wrong with your forehead（前额）？
I knocked my head on the tree while I _____my dog．（ ）
A．walkedB．was walking
C．has walkedD．am walking
和
，地球表面的重力加速度为g，则火星表面的重力加速度约为 （ ）
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