如果水库的水位高于标准水位3米时,记作+3米,那么低于标准水位2米时,应记____ 米.
— Yes. He never praised him ________ he became one of the top students in his grade.
下列改革没有引起社会性质改变的是( )
密密层层 严严实实 葱葱茏茏
树木长得____,____的枝叶把森林封得____,挡住了人们的视线。
如图是五种微生物图,请据图回答下列问题.