In Study 4, the researchers trapped birds for 10,000 hr per year. Thus, how many insectivores were trapped inYear 2 ?
A. 80
B. 100
C. 800
D. 1,000
such learning takes place are so varied that it is【C6】______to explain
A. simple
B. natural
C. practical
D. difficult
将“故远人不服,则修文德以来之;既来之,则安之”译成现代汉语,并说明孔子这句话所表达的观点。
According to Study 1, the reflectance of white S at a wavelength of 0.40 μm is closest to
A. 0.0
B. 0.1
C. 0.2
D. 0.3