五一黄金周里，很多人选择外出旅行。但不少人在享受优美的环境时，却不履行爱护树木的义务。下列行为符合合格公民要求的是( )。A．在文化
T℃时，物质A在水中的溶解度为10克，则在T℃时的A的饱和溶液中，下列质量关系中正确的是 A．溶质∶溶剂 = 1∶1 B．溶质∶
从生物学的角度分析，诗句“梁上有双燕，翩翩雄与雌……青虫不易捕，黄口无饱期……须臾十来往，犹恐巢中饥”主要反映了( ) A．燕子在梁上翩
试题关于下图中种群数量变化说法错误的是 A．种群J型曲线只有在理想条件下才能出现 B．种群呈S型增长过程中，在达到K值之前就是J型增长 C．自然状
___ of the world's books and newspapers are written in English. A. Three quarters B. Three quarter C. Thirds four D. Threes fourth
Third-generation mobile phones, known as 3G, are the next big step for the telecom(电信) industry. Data speed in 3G networks is much quicker than that in present technology. This means users can hav
There is _________ that her daughter will pass the exam to go abroad to study. A.chances B.likely C.a high chance D.possible
Mr. Smith suggested the problem worth paying attention ______ at the meeting. A. to be discussed B. to being discussed C. being discussed D. be disc
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