【单选题】Which of the following factors has hindered the progress in Africa?
【单选题】The climate in Beijing is colder than ________ in winter.
B.
the climate in Shanghai
【单选题】The climate in London is quite pleasant, the temperature rarely, ifany, ________ 30 ℃ .
【单选题】The climate here is quite pleasant, the temperature rarely, , reaching 30C in summer.