What can be inferred from Paragraph 5?
A. The Wuhan Huanan seafood market was blamed for selling bats.
B. The coronavirus was directly transmitted from bats to humans.
C. The intermediate host spreading the virus remains unknown.
D. Bats are not responsible for the outbreak of the coronavirus.
查看答案
What is the main point the author makes in the last paragraph?
A. Virus-carrying bats should be killed.
B. Humans should stay away from bats.
C. Bats benefit but also harm our ecosystem.
D. Bats could spread viruses during pollination.
请认真观看视频，将关键听力技巧整理成笔记记录在下方。
当元件两端电压与通过元件的电流取非关联参考方向时，假设该元件（ ）功率
A. 吸收
B. 发出
某电阻元件的额定数据为“1kΩ、2.5W”。正常使用时允许通过的最大电流为（）。A.B.C.
A. 50mA
B. 2.5mA
C. 250mA
微信支付 
支付宝支付