【单选题】What made it possible for Tim to see the entry to the cave?
A.
The height of the first rocks.
B.
The ups and downs of the waves.
C.
The change in the position of the sun.
D.
The vast stretch of the sunlit beach.
【单选题】当空气的相对湿度为98%时,空气的干球温度t、湿球温度tw、温度td三者的关系为()
【单选题】空气的干球温度为t,湿球温度为tw,td,当空气的相对湿度φ=90%时,则 。
【单选题】At first, Tim grew tomatoes ____________.
A.
to sell at the Farmers' Market
B.
To eat in his apartment