读一读,描一描。
① ____
② ____
③ ____
④ ____
南方地区农作物一年两熟至三熟的主要原因是( )
把标有“12V 12W”的灯L1和“12V 6W”的灯L2串联起来接在电源电压为12V的电路中,下列说法正确的是( )
Learning English online
Ways to learn English
English magazines, newspapers and radio
Various kinds of English learning1.
Benefits of online learning
People around the world can visit them 2.
People can get answers instantly on the Internet.
People can learn what they need anytime and search for useful3 without leaving home.