The author's attitude towards the future of China's AIDS problem might be described as one
A. worried.
B. indifferent.
C. optimistic.
D. frustrated.
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What measure was taken against floods in London in the 1980s？
A flood wall was built.
B. Rescue teams were formed.
C. An Mann system was set up.
D. 50 underground stations were made waterproof.
某工程影响一个生态因子，影响的范围为50k2，物种的多样性减少45%，此项目生态环境影响评价级别为()
A. 1级
B. 2级
C. 3级
D. 低于3级
PM10是指悬浮在空气中，空气动力学当量直径()的颗粒物。
A. ≤100m
B. ＜100gm
C. ≤10m
D. ＜10μm
对房地产的抵押，在抵押期间不征收土地增值税。但对于以房地产抵债而发生房地产权属转让的，则应征收土地增值税。 ()
A. 正确
B. 错误
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