下列四幅图中,正确表示极地东风的是
A、①③
B、②④
C、①④
D、②③
答案:C
—Where did you go on your holiday?
— _________.[ ]
A. I went to Hubei
B. I'll go to Hubei
下列不属于生物防治的是()。
A.以虫治虫
B.以鸟治虫
C.以微生物治虫
D.饵木诱杀